G&G M14 Hop Up Help please!

[clockworkak]

Well here is the issue

I have a new G&G M14 Veteran with Walnut stock and its a beast.It was shooting near 417FPS so I had it reduced to to what the dealer said wa 320..it chronod at 340 with 2.5s and it did not matter what I did to the hop the bbs (shooting 2.5s) flew about the same distance as my G&G M4 rush before sailing straight up in the airwhich gave me a wonderfull gun with the same range as a cheap m4!
Not what I bough the gun for so the question is do in need to use 0.30 or is there a trick with Hop Up im missing as the M14 hop up is different to any ive usd before

Please help!!!

Many thanks

ClockworkAK!

[jonny lovegrove]

Sounds like the nub is sitting incorrectly. They sail upwards even with it turned right off? I found with most g&g hops that they apply a lot of hop in the first few teeth.