A nice chap that goes by Stretchyman put me onto some devices I was not aware of. Specifically, the UCC27614DR gate driver and the GAN111-650WSBQ GaN FET. I had a go this afternoon with throwing them together in a similar layout as my last try with the IRF510.
So far I'm getting good results. Out of the gate I was getting 10W out with decent efficiency. I haven't let it run long yet.
As an aside, I noticed that my probe was having an effect when I put it on the dummy load. Switched it to 10x and that fixed that.
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