You are probably a size or 2 rich on the mains, that will make a huge differenc eon the SLp twins....they need heat to work..
Also, are they the newest version of the VES 800 SLp twins?? SLP had a early version that didn't work good at all, make sure the part number is the same as the current model, if not...there is your problem.
Also, get rid of the balance bottle.
You should be able to pull 60-62's, my '02 ran 64's up to over 8,000ft and 66's below 6,000. This was with more helix and a 140/300 primary spring.
Also, that finger track will cost you some RPM, especially in the heavy spring snow.
I would jet down on the mains, needle in the middle.