I used to stand develop some films in Rodinal 1+100, 1h, ~20C with no agitation whatsoever. I used to work but than something obviously changed and after some point it didn't work any more - I lost a few nice shots to uneven development i.e one side of film was quite underdeveloped. This weekend I've tried semi stand with about 5 gentle inversions at the begining and at 30min. Development is even however the FP4 @125 are obviously denser than I was used to and expected. I didn't have time to print contact proofs yet so I cant say if I'm happy with tones and grain. What is minimal agitation while developing semi stand I can get away with? Or should I rather shorten time?