Ok, times for rodinal 1+50, 20C degrees, 35mm tri-x400 shot at ISO1600. Looking at massive dev. chart I see a reading 18,5 minutes, but that has to be incorrect - right? I have developed with same dilution and same temperatures at ISO800 - 20 minutes! And by using the guide - 2 stop push, increase the time from normal dev, x2.25 so that ISO1600 should be more like 30 minutes. ?? What about agitation - I have used 10 seconds every minute - light agitation, not shaking like a maniac. Also if my times for ISO800 sounds weird, please let me know. Thanks.