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By "upgraded to the titties" I presume you mean it also has a metal slide (at the very least). The metal slide is heavier... upgrading TM pistols like this is almost always a PITA.
If its working reliably I'm almost willing to bet the mags have upgraded (higher flow) valves. This will improve reliability at the cost of more gas being used. Moreso if you're firing rapidly.
You don't want the routers sitting too high or it'll cause friction with the BBU and cause even more problems. I mean, they shouldn't even be "worn down" since there shouldn't really have been much contact to begin with.
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