[Hectic]

so im working on a "high speed" build.
I use the " " as its not much of a crazy build.
I started with a cyma mp5sd6 i pulled it apart (i gotta say wtf? They must have slimer from ghostbusters working there using his green slime to lube there boxes lol)
Anywho back on track. I out super shooter/shs 13:1 gears a lonex red piston and a modify m90 (or however they lable em its a 90 anyhow) spring and a sorbo pad (from a vsr10 but its pretymuch a perfect fit)
I spent alot of time shimming it as the bushings are a lil funky (they stick up far from the box) and it seems to be shimmed well.
I corrected aoe (had to shave an additional tooth off the piston)
And i removed the clear flimsy tappet plate and put in a stiffer white one (from a JG box i think)
Anyhow everything fits nice and i threw it together.
Once i test fired it it jammed up to the rear of the box (like as if the sector engaged early)
So i opened it and found that the spring had slipped over the bearing of the guide causing the piston to stick onto the guide.
I tweaked the spring a lil (squished the last coil a lil so it cant slip over the bearing)
So now i find it still seems to stick to the rear. If i screw with it a bit (keep pullin the trigger randomly) itll eventually compleate the cycle but only after the wires get hot.
Im using a 9.6 1600 mah battery and i figured it should work fine on such a weak spring. Am i missing something. Could it just be bsdly shimmed and im not beinng picky enough? Should i swap the bushings for bearings maybe so itll spin more freely.
The battery is as bit as i can fit in the gun so thats not really an option.
Im i being unrealistic, is a 330ish fps spring and 13:1 gears too much for a 9.6v 1600mah?
Guess i just need to know what to look at next. Ima try shimming it a lil looser and see if that helps but otherwise im at a loss.

Pardon my ranting just tryin to get this up for friday.