Hiya, thanks for the advice (esp. on the finishes). Yeah it's definitely a 2K1 - it's got the RVA, ball bearings and fibre optics.
It's not so much a velocity problem I'm having, but a bolt cocking problem.
Luckily, I came across a post a couple of seconds ago when searching that mentioned using a 3/32" allen key to loosen the rear grip frame screw and turning the RVA cap by a half-turn should fix the problem I'm having (hopefully).
Now I just need to find the right allen key...
Thanks for the help!