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I used the mod by DJ2QV.

He wrote :? Now the Output power was still low and current too high. Further Investigation indicated that
the Class E amplifier is somehow loaded by the path to the RX/TX Switch via capacitor C33.
My Feeling was that at 14 MHz the value of 1nF is a Little too high. Probably too much RF is
coupled to the drain of Q5 and causes some nasty effects here. So I changed C33 to 150 pF
and immediately the current dropped to about 0.6 A and I had much more power.
Optimization of the bandpassfilter inductors and the L4 choke resulted in 30-32 V p-p at 50
Ohm, so about 2.2 to 2.5 Watt. That was also measured with the internal power meter (really
nice function!).

My QCX has 5 Watt output now.

Good luck

73 John PD7MAA