If you can't clear the wake, you don't need to be adding ballast. Last week we took out the hard tanks in my friends 03 VLX and replaced them with 750lb. sacks we then went boarding without the wedge and the wake was HUGE...however, I wouldn't say that the added ballast made it easier to clear the wake. Adding ballast will change the shape and size, but if you can't clear it with stock ballast (or even unloaded) then you really need to be working on your form instead of sacking it out. What year LSV and what ballast do you currently have?
I notice in your profile that you only weigh 100lbs. Maybe (and I am not meaning to be rude) but you just need to grow a bit and get a little stronger. Once you have the strength down, you should be able to cut harder, ride faster, get bigger air, etc... and then maybe clearing the wake won't be an issue???