I've used ORS lye before and it did NOTHING AT ALL!!!
I used to think a lye relaxer couldn't get my hair straight and I would always have to use no lye because it would at least get my hair to a desirable straightness....
I tried Vitale Life and Body Relaxer (lye) and I like it, gets hair bone straight, with minimal smoothing for my 4a/b hair!
I also have an extreme sensitive scalp and it doesn't burn (I also base my scalp though).
Give it a try you might like it. Vitale Sensitive Scalp (No lye, it comes in a shiny blue box) is good as well if you decide to go that route...
HTH