I’ve got one leg shorter than the other and use heel support, which is always an under-correction (never higher or even even than the leg difference). I used to have lower back pain/irritation on the shorter leg’s site, but this is almost gone now. I also tend to stand on the shorter leg, but I try to avoid this. The things I’ve realised and been adviced are (1) whatever you decide to follow as ‘treatment’, follow it permanently (not for every day life only, but in training, too) and (2) give some good time to your body to adjust to things (when I first used heel support, things were worse). I would lastly spend some good time finding a good podiatrist, as mortac8 says, who knows what s/he is doing, if you decide to wear orthotics. Just my experiences here as I don’t think it would be wise to tell you to do this or that via a forum. In any case, well done on coming back!