Nice job Sal! The three pairs of SDA's that I've done with Sonicaps all sounded better than original right away. I noticed the bass was tighter, a larger more pronounced sound stage right away. The highs were not as sharp, and over time the highs got very smooth almost sweet sounding (hard to describe). I never heard any screetching, except for my wife yelling "Turn that damn thing down!"
Enjoy the fruits of your labor!