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I don't think 1W on 6m is normal; are you confident of your power measurement? For example here we use the David NM0S QRP-o-Meter and initially also read low power on 6m; until I read the QRP-o-Meter spec and it said clearly 160-10m hi hi. Then measured using the oscilloscope over dummy load method and got much better results. At 6m, cables, dummy load, power measurement, all matter and could be more inaccurate than at lower frequencies. If you are really sure it's only 1W then I'd recommend checking the board, soldering of capacitors, number of turns on the toroids, and compressing/expanding the turns on the 6m LPF, to peak it.?