Thanks Jaans, some really valid opinions in your post. I also used to develop tri-x in Rodinal 1:50 without any side effects, so maybe its time to return (what I did like about stand was the fact you do not have to care about temperature). Your advice about 1:100 dilution is similar to Agfa process times I´ve found somewhere and I would be interested in your (or anyone else, of course) opinion about it:
Rodinal 1:100 ISO 400
20 degrees Celsius 20 minutes
agitation constant for the first 30 seconds and then 5 secs every 30 sec.
cheers
Janek