Just one step at a time ....Did replace R97 and R98 (47 ohm) on the mosfets gates with 10K resistors ...Improved drive and output?
And likely more instability.? Your getting more because the drivers cant so your making what little you get available to the MOSFET.
Solution is not, symptom is lack of drive available.? Work backward, assume irf510 does 13db of gain (power factor of 20).
IF you want 10W out you REQUIRE .5W in.? If you do not get that, low power.
Allison
