I haven't re-jetted my VN750 yet, but have done several other bikes with CV carbs. I'm down to about 45 minutes from start to finish on my other bike. I am attaching a file that shouls help you out, but here is an explanation in a nutshell.
The pilot (or slow) jet provides the fuel at idle up until roughly 1/4 throttle. The most noticable effect of an incorrect mix from the pilot jet would be either popping on hard decel (lean condition) or rough running wet exhaust at idle.
The vacuum slide and needle take over from about 1/4 throttle to 3/4 throttle. The taper of the needle is the critical element here. I've never used the Factory Pro kit, (I'm a Dynojet guy) but I've never really had any problems in this area.
The main jets are what I suspect are causing your problem. These kick in from 3/4 throttle to full. Obviously if they are too small, you will experience top-end starvation.
A simple trouble shooting effort would be to wrap tape around your throttle and mark from 0 to 4 (quarters), and run it to see where your issue starts to turn up. That will tell you where to look.
From the looks of your intakes, I would suspect that you are providing the maximum amount of air the carbs can handle. With Dynojet jets, you should be somewhere between 130 and 144. This will vary depending on altitude and exhaust.
If you can't work out the Factory Pro, you can order DynoJet jets directly from DynoJet [www.dynojet.com]
for $2 each plus shipping is 6 or 8 bucks. It would cost less than $30 to buy a handful of jets (step 2) and fine tune the carbs from there.
Hope this helped. Good luck.