Turntable adjustment question

I have recently purchased a used Micro Seiki BL-51 table with SME tonearm and Grado Gold cartridge. It sounds fantastic; however, I think that the left channel is more predominate than the right. I love stereo equipment and know a fair bit about most audio equipment but this was the first good table I have ever purchased (and I know it isn't fantastic but I got the package for $350 and I couldn't rationalize getting a clearaudio champion or VPI scout for more than 4 times that cost when the Micro sounds as good as it does) I am pretty sure taht the left bias is due to an incorrect setting on the tonearm but I have no idea what to check or adjust and I don't want to start adjusting random things and end up worse then I was to start. The arm has an anti-skate weight that hangs on a fishing-wire-type line and it has several different counterweights on the arm that are adjustable. The cartridge also seems to have a bit of twist to it (I can move it to the left and right but I think I have it perfectly centered right now and still the bias is there) so that might be the cause. Anyone have any idea where I should start or as a newbie is this going to get so frustrating that I want to hurt someone and I should just take it to a shop who will charge eighty bucks for the adjustments?!? The other weird thing is that the bias only appears on some albums but those same albums on my Dual 1214 never had a bias! Please help!