the illusive power band is where the power gets stronger over about 6-8K depending on the bike setup.
are you revving the bike close to the redline as 2Ts make their power high up the rev range.
take it to your local duel carriageway and cane the bike right up to the edge of the red (or into it if you are a bit of a masochist) and do this in every gear until you have to brake.
and that it, just sounds to me that you are changing gear to early
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold