I hate biasing!

 You should be using a plastic bias adjustment tool and not a screwdriver. If you are using tubes that are properly matched, you should not have to adjust the bias much once the tubes have initially settled in.

 The ARC Ref amps are very easy to bias. There are a lot of more difficult amps to bias. Look at some of ARC's older tube amp designs.

 I check the bias of my Ref 110 every month or so. But I have not had to adjust the bias in quite a while. They are always spot on. Usually I only have to adjust the bias the first couple times after I install new tubes. After the tubes settle in the bias should not move much. If you tubes are continually drifting, there could be an issue. How many hours are on the tubes? When tubes start getting to the end of there life span, they can start drifting.