UB SNG tracking players

[SumZero]

How much do people who play UB SNG track opponents (especially play 3 tables at once)? The inability to get hand histories easily make this hard for me. And I find the notes on players hard to keep+maintain+notice. But yet I recognize 2 or 3 people in nearly every SNG I play due to the level+time that I tend to play. So I feel I should try systematically tracking these people, but I'm not now because I haven't figured out a good system yet. So any suggestions?