I'd like to use Unicolor drums to process 8x10 HP5+ in order to avoid the scratches that occur all to frequently with my tray processing. I already have several drums.
I'm in a farmhouse here with my darkroom wastewater being discharged into a septic tank system and would prefer to use XTOL for enviromental reasons. I'd appreciate the benefit of others experience on (obviously, starting) development time/temperature/film speed for HP5+ developed in XTOL, 1:1 dilution or greater. Ilford suggests a "up to a 15%" reduction in developement time with rotary tube processing; this is obviously a range - what reduction has worked well in practice?
Thanks in advance.