To OP: I've had the exact same problem. Backhand slice with my VC95's just isn't nearly as effective as with my other racquets. Which sucks because it's my main stick. I've had ups and downs with the backhand slice on this frame.
Recently, I've had it set up with around 2.5 - 3 grams total at 3&9 and to be precise 0.65g at 12. Less lead than I've had before with these racquets but I wanted to try out a few things.
This week I took off the little lead at 12 and put on strips at 12 from the aero fins at one side to the aero fins at the other side. (See pic) Kept the lead at 3&9 in place.
I played with it yesterday evening, just hitting as well as match play. It massively improved my slice, as well as other shots and factors. Where normally I had trouble to keep the balls low and penetrating, yesterday they were perfect. I'm going to keep trying this setup for a few weeks and see if it holds up.