I wouldnt be so sure right away. Compression testers are all a little bit different (length of hose, construction of hose, etc.). Now your dry numbers do seems a bit low, but they are all within 10% (except for #3).
As for the wet #, did you put in exactly a tablespoon of oil? More or less can play with the numbers a bit.
First thing I would try if your worried about compression, is get some Seafoam and pour about 1/2-3/4 cup in each cylinder (i usually pour any remaining Seafoam in the top end through a tappet cap) and let it sit for a week. Turn the engine over a couple times with the electric start to get it out (throw a towel over the engine, otherwises you'll shoot seafoam across the garage (or across the street if you're outside) and try your compression check again.
The seafoam will loosen stuck rings. Now I dont believe your compression is a problem. A problem would be if you had one cylinder significantly different than the rest (maybe two).
But I could be completely wrong as I'm not the one working on the bike and experiencing the issues.
While you soak your cylinders, it would be a great time to pull the carbs and disassemble them, clean them, and replace all the rubber bit (remember, unless someone has done it before you, that rubber is 34 years old, and with ethanol fuel they could be weak. Also you can make sure your jets are free and clear).
Another thing that isnt a bad idea, is to buy yourself a point file, and drag it across your points (top and bottom) a couple times. This cleans any corrosion that might have built up on them.
I dont believe your having compression problems, I'm guess your issues stem from ignition or carb issues.