chances are the TM bb's might be a wee bit larger in size and are able to make that little bit more of a contact then the KSC bb's. We're talking marginal size difference but perhaps it was enough. ( ~ .01 mm ).
What other AEG do you have the guarder hop up in? Does it have a different set up of hop up then your AK? If so that is probably why you have decent performance with that gun and not your AK with .2's.
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