How to Compress & Keyframe-reduce a Generated Animation?

Hi all, I wrote a script to remove the Scale curves from an animation because often I don't need them. I'm using AnimationUtility GetAllCurves and SetCurve to make a new animation with only the curves I want to keep.

The generated AnimationClip does have fewer curves, but the file is about 4x larger! I suspect this is because I'm no longer benefitting from the Model Importer's Animation Compression and Keyframe Reduction.

How can I reduce the file size and take advantage of these optimizations??

Script: using UnityEngine; using UnityEditor; using System; using System.IO;

 public class RemoveAnimScaleCurves : ScriptableObject 
 { 
     [MenuItem("Util/Remove Anim Scale Curves")] 
     
     public static void CleanCurves() {
         
         foreach ( UnityEngine.Object o in Selection.objects) {
         
             if (o != null && o is AnimationClip) {
                 
                 AnimationClip selectedClip = (AnimationClip) o;
                 AnimationClipCurveData[] curves = AnimationUtility.GetAllCurves(selectedClip);
                 AnimationClip newClip = new AnimationClip();
                 
                 foreach (AnimationClipCurveData curve in curves) {
                     // Weed out Scale
                     if ( ! curve.propertyName.Contains("Scale") && curve.curve.keys.Length > 0 )
                         newClip.SetCurve( curve.path, curve.type, curve.propertyName, curve.curve );
                 }
                 
                 newClip.name = selectedClip.name + "_NoScale";
                 newClip.wrapMode = selectedClip.wrapMode;
                 
                 Debug.Log ( "Old Clip " + selectedClip.name + " has " + curves.Length + " curves" );
                 Debug.Log ( "New Clip " + newClip.name + " has " + AnimationUtility.GetAllCurves(newClip).Length + " curves" );
                         
                 SaveAnimationClip( newClip );
                 AssetDatabase.SaveAssets();
             }
             
         }
     }
     
     public static void SaveAnimationClip(AnimationClip a) {
         if(!Directory.Exists("Assets/Animations Generated")) {
             AssetDatabase.CreateFolder("Assets", "Animations Generated");
             AssetDatabase.Refresh();
         }
         string path = AssetDatabase.GenerateUniqueAssetPath("Assets/Animations Generated/"+a.name+".asset");
         AssetDatabase.CreateAsset(a, path);
     }
 }