This is how i understand it.
Your first dyno made approx 90hp at 8000rpm. The second version after the head work - flows more air and obviously seeing the torque peak is higher and earlier in the rev range the heads also have a much better gas velocity speed .
even though the power falls at 8000rpm with the new head it still has over 90hp wich is more than the original at 8000rpm .
If you want the power band to be extended - wich i would also want you have a few options to try .
To maintain VE you can retard the intake cams. The second thing would be to shorten the intake tracts by removing the airbox .
If the 2 obove things dont give the powerband you require then the intake port needs to be enlarged to cope with the engines larger capacity.
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