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Quick test for you to try, put the gearbox back together with no spring, cylinder or anti-reversal latch and manually move the piston to the rear to see if it get tight/stuck at rear.
I have had off spec SHS pistons cause issues in my VFC V3 gearbox's in the past with locking up, they would literally get stuck at the rear of the gearbox. Going back to stock or another SHS/other brand of piston would fix the problem.
May or may not help with your situation but definitely something worth trying.
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