<p>Cam,<br>
This works for me on Acros, PanF+ and FP4+. Rodinal (1 in 100) semi-stand with continuous inversions for first minute, than stand for 1 hour with 1 gentle inversion at each of 15, 30 and 45 minutes. Now trying with Arista EDU Ultra 100 and Kentmere 100. Low to medium ISO films only. To avoid gradient lines I always overload the tank a little. eg, 400 ml not 300 ml, 600 ml not 500 ml, etc.</p>