I heard the .060" trick came from Tom Cook. At the time we heard about it, there were about 6 of us running OS.91s and Dynamaxes around here. We all started using this method and we never had to readjust the low side. We all used JMP pitot pressure.

CARS II
Put some red loctite on your head bolts and they will stay tight a lot longer. In fact they won't get loose unless you have a real lean run.
Your OS .77 has a different carb on it so this trick won't work for you. Did you know that you can run the backplate, rotor and carb from an OS.91 on your .77? I did it to one of mine and the performance was outstanding. Anyone that has run OS.91s for several years will probably have some parts laying around. If you want to give the mod a try and can't find the parts locally, let me know. I might can scrounge up the parts you need to do the switch. I had to do it because there is a very small screw inside the barrel of the OS.77 carb that has a tendancy to break. When I ran several .77s, I kept a few in my flight box. Now I'm sure they're impossible to find. Once it breaks you will have a heck of a time keeping it running, at least I did.