Be careful with that, self oscillating circuits rely heavily on propagation delays, so replacing parts by different ones without shifting the operating frequency too much is tricky.
Do waveforms improve with the new transistor set?
Accounting for faster gate rise time, yes, the total propagation delay is reduced and so is time between turn-off and turn-on. Buy increasing peak gate voltage you also increase the turn-off charge to be yanked out of the gate, which can also add to undesirable overlap. This might not be the entire reason switching frequency doubled, but it is probably a major factor. I'm not certain but I don't think the differential/level shift transistor changes you made would have that much of an effect. They'd just be easier to cool. You could always put the MPS transistors back and see.
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