One very important factor in lowering the noise floor is getting overhang and cartridge alignment right. I just did my set up once again with my MintLP protractor, and found overhang a bit off. I reset overhang, checked alignment, and was immediately stunned at the reduction in surface noise I was hearing, even on lp's that were practically unlistenable. It pays to re-check your set up occaisionally, it takes very little to make a large difference.
Regards,
Dan
Regards,
Dan