Having a BC 2 gain increased at factory

I own a pair of Blue Circle BC-2 monoblocks. As I am readying them be sent to factory, I wonder if I am able to increase its gain in the factory. In comparison to my other amps, its gain is rather low. The different with my preamp volume on the BC-2 is about 1/4 or 1/6 off. I mean, if I run a different amp, SF Power 2 or even the DNA 225, I would need to have its volume at about 9 am, but with the BC 2, I need to have it about 11'o clock in order to get it going satisfactorily.
Will I clip the amp faster if the gain can be increased? What are the advantages or disadvantages of doing such procedure?

PAUL