A stronger recoil spring will definately help, Wolff sells an extra power which I'm going to get the next time I make out an order for springs. The stock springs are about as stiff as the Makarov, however, the slide is so much more slenderly contoured it doesn't have the mass to really buffer the power of the 9mm Mak round.
I really do like the pistol, I consider it quite a value at the $139 or so dollars I paid for it. It looks to have seen very little use, and is very well made. I like the chrome lining in the bore, this seems to be standard to a lot of eastern block guns. I wish more US made guns had it. I really haven't fired a lot of rounds out of it, but those that I have, it's been 100% reliable, the sights are right on, and it seems to be very accurate (I haven't benched it on paper yet, but it'll whack pop cans easily at 25 yards.