In testing per the video cited (scrunching L4 and L10's turns closer together), I was able to get the output up to 2-1/2 watts but that only made me more convinced -- as you said -- that the BPF is the major factor in this situation.
Yes, I did.? Perhaps my surmise above was incorrect. As I said before, I'm reluctant to butcher the radio when it operates perfectly well on 20m through 12m so far as power out is concerned -- and I am fine with 2W on 10m for the moment. I have a Low Band QDX coming and I will be more circumspect about winding L12 and the LPF coils on that.?
Dunno.
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William, k6whp
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"Cheer up, things could get worse. So I cheered up and things got worse."
k6whp