Depending on V2 gearbox...
Some have a stop on the top half of gearbox that limits the trigger "tang" on fill final pull
Here on the tang you can add thin material to very slightly lower the final pull
Also add a small thin material underneath tang to lower the rest point, take up a tiny bit of slack at rest, though the safety arm might need modding to operate
Then for finer tuning cut trigger itself add material to trigger & trolley etc...
All using epoxy and hope all them bits don't come off in use or whilst you mess about filing and checking shit & how it all operates
A bit of a wank all round
So called speed triggers sometimes don't work quite like they should
Often the trigger face jumps off the trolley at full pull than work out of the box like people expect them to do
So called speed triggers often imho just look like speed triggers but need modding at times
So any trigger modding is a PITA
Best advice I can give to most people...
If it works OK and you can live with a slightly longer pull - leave it as is
If when stuff gets worn/wanked, jumps off trolley etc...
Then yeah have a go at taking some slack out - nowt to lose
Issue is, if you mess up you will need a new trigger/trolley
So you need a spare lot to hand & if you got nowt lose why not have a go
But it don't make you shoot more accurately - it is mostly personal preference
Yet it can be a wank and time consuming