Thanks for your reply. I've got the cnc pistons from the TRF hop-up kit... yes, they smoother than the ones on the sprue. I have to use Losi springs and cups because I'm using I&Q dirt shields. I doubt the make of spring is the issue (I've compared them on the Excel chart... unless I'm missing something) it's more the choice of piston, oil and spring stiffness.
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