bias Classic 60, Audio Research

Hifigeek, I recently purchased a Classic 60 and tried to bias 8 Philips 6550s over the weekend. It was supposedly already biased "perfectly" with Svetlana 6550s by a technician. However, when I put in my bias meters into the tube sockets, the two left tubes measured 60ma and the next two read 50ma current draw. The right channel read 55ma and 60ma. I assume the slave tube is behind the master? tube? The only bias pot (blue white center) I could find was in the back and it was turned fully counter clockwise so I could not turn the bias down, only up. The "small access" holes on the side?? do you use a very small philips screw driver?? that is what I see and not the red plastic bias screw driver. Anyway I was lucky and found 8 tubes out of 14 that would read between 55ma and 60ma. So I am confused, it seems you need a matched octet of 6550s instead of 4 matched pair?? as the manual states. Am I missing something? I sure like the D70MKII and D76a bias adjustment better. Any comments would be geatly appreciated.