Odd as it sounds I've found with my own direct blowback rimfire pistols that the recoil energy of the rounds is related more to the bullet weight than the velocity. Oh sure, you can overpower it with the 1640fps stuff but that's using the sledgehammer approach.
I had one gun which worked fine with 40gn standard velocity but had week ejection and frequent jamming with the 36gn HV ammo. I figured out finally that the heavier bullet stays in the bore for longer so the casing sees a longer recoil impulse which did better at cycling the slide. The lighter but faster HV ammo isn't any more powerful, just faster. So the shorter time it stayed in the barrel actually resulted in a lower total impulse energy to the slide.
So you might want to try the gun with some heavier bullet style ammo. Or if you want to use the regular and easily found HV ammo such as Blazer then it sounds like you might need to clip the recoil spring by one to one and a half turns to slightly weaken the amount of preload holding the slide closed.
In addition to the jamming take note of the distance the empties fly. A gun prone to frequent jamming will have a weak ejection distance where the empty cases either dribble out over the back of your hand or arc up and down over a foot or less distance. If I'm right then if you can try some 40gn CCI or other brand of SV ammo the ejection should be stronger with the empties flying out a good two feet or more. If the heavier bullet SV ammo does the trick then you should be able to tune your M93 to the cheaper HV stuff by clipping the recoil spring as noted.
