I do Ilford fp4+ in Rodinal 1:100 lately. agitate the first minute, then about 45 minutes at 68 degrees. Seems great, but I have done more testing than shooting. Still, I have my "real" film speed, and also a plus and minus times.
Oddly, any film that I take the trouble to test, I get low personal speeds- to get .1 over FB+F, I have to rate Ilford FP4+ at between 20 and 32, depending on how much contrast I'm developing for. I think it is my light meter, so I don't worry much.