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Even in semi, it's normal for the piston to be drawn back a bit before it stops...the main spring pressure and the resistance of the motor are the only thing stopping the gears from rotating after the power is cut and there's still spinning momentum in the gears. Ideally, it should stop at about the same point after each semi shot. Don't worry about that.
I would suggest that you consider replacing the hopup unit. I've only used a couple of the modify one-piece metal hopup units and I couldn't get them to shoot well in the 3-4 builds that I tried before I scrapped them. Too bad because they looked good and were priced nicely. Same thing with sort-of jamming, wonky FPS. For me they'd usually blank fire then double shot the next trigger pull. Swapped out for either a G&P or KA Enhanced and zero issues with all of those builds. I tried over and over with the Modify hopup until I just threw it out.
With the inner barrel, hopup rubber, nub and hopup unit assembled...you should be able to see the "lip" of the hopup rubber seated nicely in the hopup unit (no bunching...nice even ring of rubber). Turning the hopup on or off...you should see the nub evenly push down into the barrel and raise back up.
To install the nub, turning the hopup upside down and poking the nub with a thin pick until it seats in the notch is fine. Taking it apart and putting it under the hopup arm while the barrel/rubber is already in place is fine to...but I always worry about the little screw that holds the main adjustment wheel in place snapping....I had it happen on 2 KA Enhanced units (BNIB)...and unless you can get the screw shaft out, you've just pooched a perfectly good hopup unit.
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