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Might sound too simple, but you can buy another set of bearings - they are supposed to be small enough to fit inside, and if all brands of bearings give you the same problem, then that piston must be pretty off-spec, just buy a better one.
Technically of course, with some grease on the end of the spring (or a thin nylon washer) you could go without bearings in there at all, like most every entry-level AEG made.
I agree that filing those bearings isn't a great idea - it might turn out well or might give you grief if some part of it doesn't go exactly right.
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