currently my bike is a 99 gsxr 750 w/full 2bros exhaust and k&n filter with 5200 miles on it when i had this done i brought it to my stealership due to it being lean..they turned up (with the yosh box) my settings to +3,+3,&+3
1)before i buy a pc2 or have anything done does this need to be zeroed out again
2)they didnt use a dyno so it cant be that good but its not that bad what are the three +3s low middle and high fuel?
3)the reason im considering all this is because i just rode a friends r6 after getting pc3 and map it had gobs of midrange...is it possible to get more midrange out of my bike?

You don't need a PC , the Teka will more than sort it out if used correctly.

You really need a AF meter of some description to get close.

Bite the bullet and get it done properly and you'll know it's as good as it can be.