its not the amp/sup moved that over and still the same.
and i measured the drop i needed from the arches but then adjusted that accordingly to the coilovers so its the same height each side from thatn i know 
so should i drop it more on the other side to compensate for the fuel tank? iof thats what it is, and will that affect anything like handling etc
No whatever happens do not set the coilovers different it will mess with the handling, trying to set it from the arches will not work, as I said earlier measure from the base of the spring plate down to a fixed point on the car, you may then find they are out.
I would add that even with the coilovers set the same you may never get the car level, mine was not and I gave up worrying about it in the end.
