FWIW
an keeping it simple,,, more wind, less sail...your right the thicker 80% is for stronger winds,,, the lighter 110% would be lighter winds...
If your just getting started an not sure, start small and go big later if you feel comfortable,,, an if you need the 80 you maybe should be putting a reef in the main also,,, or reef the main and try the 100%... it gets to be a feel for the forecast and what the winds are doing and how much the boat is listing, how scared your crew or you are getting...
Say winds winds are light, at 3-8, a full main and the 110 or larger if you get a Genoa later...
winds 10-15 maybe the main and the 110 or 100...
winds 15-20 a reef in the main and the 100 or 80
winds 20-25+ just the reefed main, an a storm jib if ya get one later...
That should keeep things comfortable.... Others here should chime in as I'm just saying what I generally do an they may have a different set... I may do things different with my new main butt....
A lot will have to do with the comfort level and skill of you and your crew,,, how your boat handles and your ability to trim all the gizmos that affect sail shape... really you don't want to be in over your head when you decide you have to much sail up,,, so better to start smaller and go up then the other way 'round...
My rigger was telling me of a guy that went out not long ago in strong winds with gusts also, and put up a full main and genoa,,, he was listing way too far over and then shredded his genoa,,, dropped all sail and went home... so just cuz others are out with lotsa sail doesn't mean you should be!