I was tinkering with silicone this weekend and I tried to keep it as close to the butt cap as possible. I weighed the racquet before adding any silicone and just kept adding and checking on a digital scale until I reached the desired weight. I don't see how the silicone could move higher up the racquet after a drying for a day but I'm gonna give it a week before stringing it up and trying it.
(4) Volkl PB 10 Mids
Babolat Tonic+ 16/Babolat RPM Team 17 @ 51 lbs