diff --git a/src/core/Cline.ts b/src/core/Cline.ts
index ab0ab26..cbac9df 100644
--- a/src/core/Cline.ts
+++ b/src/core/Cline.ts
@@ -107,8 +107,12 @@ export class Cline {
 		task?: string | undefined,
 		images?: string[] | undefined,
 		historyItem?: HistoryItem | undefined,
-		experimentalDiffStrategy?: boolean,
+		experimentalDiffStrategy: boolean = false,
 	) {
+		if (!task && !images && !historyItem) {
+			throw new Error('Either historyItem or task/images must be provided');
+		}
+
 		this.taskId = crypto.randomUUID()
 		this.api = buildApiHandler(apiConfiguration)
 		this.terminalManager = new TerminalManager()
@@ -119,7 +123,7 @@ export class Cline {
 
 		// Prioritize experimentalDiffStrategy from history item if available
 		const effectiveExperimentalDiffStrategy = historyItem?.experimentalDiffStrategy ?? experimentalDiffStrategy
-		this.diffStrategy = getDiffStrategy(this.api.getModel().id, fuzzyMatchThreshold, effectiveExperimentalDiffStrategy)
+		this.diffStrategy = getDiffStrategy(this.api.getModel().id, fuzzyMatchThreshold ?? 1.0, effectiveExperimentalDiffStrategy)
 		this.diffViewProvider = new DiffViewProvider(cwd)
 		this.providerRef = new WeakRef(provider)
 
diff --git a/src/core/__tests__/Cline.test.ts b/src/core/__tests__/Cline.test.ts
index 66bdbf7..11e9f9d 100644
--- a/src/core/__tests__/Cline.test.ts
+++ b/src/core/__tests__/Cline.test.ts
@@ -322,7 +322,7 @@ describe('Cline', () => {
 
             expect(cline.diffEnabled).toBe(true);
             expect(cline.diffStrategy).toBeDefined();
-            expect(getDiffStrategySpy).toHaveBeenCalledWith('claude-3-5-sonnet-20241022', 0.9);
+            expect(getDiffStrategySpy).toHaveBeenCalledWith('claude-3-5-sonnet-20241022', 0.9, false);
             
             getDiffStrategySpy.mockRestore();
         });
@@ -341,7 +341,7 @@ describe('Cline', () => {
 
             expect(cline.diffEnabled).toBe(true);
             expect(cline.diffStrategy).toBeDefined();
-            expect(getDiffStrategySpy).toHaveBeenCalledWith('claude-3-5-sonnet-20241022', 1.0);
+            expect(getDiffStrategySpy).toHaveBeenCalledWith('claude-3-5-sonnet-20241022', 1.0, false);
             
             getDiffStrategySpy.mockRestore();
         });
diff --git a/src/core/diff/DiffStrategy.ts b/src/core/diff/DiffStrategy.ts
index 2a05417..ac3a0c4 100644
--- a/src/core/diff/DiffStrategy.ts
+++ b/src/core/diff/DiffStrategy.ts
@@ -7,14 +7,11 @@ import { NewUnifiedDiffStrategy } from './strategies/new-unified'
  * @param model The name of the model being used (e.g., 'gpt-4', 'claude-3-opus')
  * @returns The appropriate diff strategy for the model
  */
-export function getDiffStrategy(model: string, fuzzyMatchThreshold?: number, experimentalDiffStrategy?: boolean): DiffStrategy {
+export function getDiffStrategy(model: string, fuzzyMatchThreshold?: number, experimentalDiffStrategy: boolean = false): DiffStrategy {
     if (experimentalDiffStrategy) {
-        // Use the fuzzyMatchThreshold with a minimum of 0.8 (80%)
-        const threshold = Math.max(fuzzyMatchThreshold ?? 1.0, 0.8)
-        return new NewUnifiedDiffStrategy(threshold)
+        return new NewUnifiedDiffStrategy(fuzzyMatchThreshold)
     }
-    // Default to the stable SearchReplaceDiffStrategy
-    return new SearchReplaceDiffStrategy()
+    return new SearchReplaceDiffStrategy(fuzzyMatchThreshold)
 }
 
 export type { DiffStrategy }
diff --git a/src/core/diff/strategies/__tests__/new-unified.test.ts b/src/core/diff/strategies/__tests__/new-unified.test.ts
index e1d568e..f8cb51d 100644
--- a/src/core/diff/strategies/__tests__/new-unified.test.ts
+++ b/src/core/diff/strategies/__tests__/new-unified.test.ts
@@ -11,7 +11,7 @@ describe('main', () => {
   describe('constructor', () => {
     it('should use default confidence threshold when not provided', () => {
       const defaultStrategy = new NewUnifiedDiffStrategy()
-      expect(defaultStrategy['confidenceThreshold']).toBe(0.9)
+      expect(defaultStrategy['confidenceThreshold']).toBe(1)
     })
 
     it('should use provided confidence threshold', () => {
diff --git a/src/core/diff/strategies/new-unified/index.ts b/src/core/diff/strategies/new-unified/index.ts
index 3e70d98..c8ca119 100644
--- a/src/core/diff/strategies/new-unified/index.ts
+++ b/src/core/diff/strategies/new-unified/index.ts
@@ -6,8 +6,8 @@ import { DiffResult, DiffStrategy } from "../../types"
 export class NewUnifiedDiffStrategy implements DiffStrategy {
 	private readonly confidenceThreshold: number
 
-	constructor(confidenceThreshold: number = 0.9) {
-		this.confidenceThreshold = Math.max(confidenceThreshold, 0.8)
+	constructor(confidenceThreshold: number = 1) {
+		this.confidenceThreshold = Math.max(confidenceThreshold, 0.8);
 	}
 
 	private parseUnifiedDiff(diff: string): Diff {
diff --git a/src/core/webview/__tests__/ClineProvider.test.ts b/src/core/webview/__tests__/ClineProvider.test.ts
index ddcd7e1..389f333 100644
--- a/src/core/webview/__tests__/ClineProvider.test.ts
+++ b/src/core/webview/__tests__/ClineProvider.test.ts
@@ -610,6 +610,8 @@ describe('ClineProvider', () => {
             true,
             1.0,
             'Test task',
+            undefined,
+            undefined,
             undefined
         );
     });