Originally Posted by KonaRider24
Try a lower gear combo, keeping seated is essential with climbing a SS. ..
How do you stay seated all the time climbing SS? Eventually, you are going to have to stand up and hammer. If you are running a gear that you can climb sitting in all the time in all conditions, then you are running to small a gear.
To the OP, I would say that strength training is the way to go. (deadlifts, squats, stiff legged deadlifts (my fave)).
When I read your post I could feel that ache in my lower back after a long day on the SS. I think you condition your body to get used to it by just doing it. Long distance low cadence climbing is just a brutal thing.