I made the mistake of developing T-Max 400 in Rodinal at 1:25 and was surprised how grainy it was. Unfortunately, it was 120mm for enlarging. For my LF negs (4X5 & 8X10) I dev at 1:50 in Unicolor drum & base so getting constant agitation. For 120mm I now do 1:80 for 16 mins with agitation every 60 seconds.