1. Velocity is in the back on the silver piece that holds all the internals in, you'll see a set screw, turning it in, adds more power, and so on.
2. What are you talking about? I'm trying to understand what you've written, but can't make any sense of it. There is no reg that comes stock on a victor II. There is a gas thru grip, which is hollow in which the steel braid attaches itself to. Which then goes into the asa where your tank screws in. Please clarify.
What it sounds like is you're trying to make it out to be a PT Xtreme or something along those lines. They're pretty much built the same, minus the 12 gram and valve size.
Spyders once came stock with single triggers, so finding one will be a little tricky, but not to hard.