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Transmitter adjustment has to be done with a constant signal level, and CW is the perfect choice.  Keep the CW operation in the lower end of the band, but feel free to use CW for antenna adjustment.  Just keep the transmissions short, with as little power as you can, and don't forget to identify.


You don't have to identify in CW, though.  Once the transmitter and/or antenna is adjusted, switch to USB and identify that way.