HI Cobalt, you say...
As RTN11 writes, your aircraft needs adjusting... the PA28 gets adjusted in roll by rigging the flap position,
Which I think means that each FLAP has its back-stop adjusted to give the desired S+L flight.
Would this be the same for a C172 as we seem to have the same 'problems'.... I have heard someone say that the tips of the AILERONS can be tweaked, but this does not look to be possible (as there is no aileron trim tab.)