My problems with steep climbing have always been either getting vertical or losing traction. I found that when I get vertical, it's because the gear I'm in is too high for the hill. When I lose traction, it's because I was leaning too far forward & the rear tire just slips around. I've found the best solution to both problems is to get a fast start before the climb, & then shift aaalllll the way down to the lowest gear & pedal faster, so that I can give the bike a steadier & more consistent supply of energy instead of giving it short powerful bursts that make the front end want to come up. This, in turn, allows me to lean further make & give the rear tire traction without flipping backwards. It's all about trial & error, & eventually you get it right. I'm still working on it after several months.