I have the new body style VLX and I run about 600lbs of lead mid-ship, under the seats. I have the manual wedge (I'm in salt water) and 1250 ballast. If I scoot too much weight to the back it gets too lippy for my tastes.
Also, If it is just my wife and I, I will put a 500lb fat sac in the floor too.
I have a 05 vride, same hull as your vlx, and just picked up about 600 pounds of lead as well. In addition to the factory tanks and wedge i'm going to put half the lead in the bow and the other half midship. I usually put 3 or 4 people in the bow before I got the lead and this made for my favorite wake.
If you are set on the 900. Do 300 on each side in the rear and 300 in the front. If you want to go another rout get 2 750 sacs In rear locker and a 1250 triangle nose sack fill stock ballast and the wake will be massive.
^^^^Like your idea Aaron. My buddies 04 VLX we did the same thing. Wouldnt get out of the hole with the stock prop. In comes the ACME 1235. Now we got the power to get on plane, and the weight to boot, that wake is amazing. I can ride at 85ft back and its clean as can be!!