John,(posted 9132 days ago)You really don't have too many choices without receiving some sort of dramatic effect. Most "normal" developers may yield the additional film speed that you are looking for but not without a significant gain in contrast. Tech Pan is a rather unique emulsion that requires a softer working developer in order to render a contrast range (CI) that falls within a usually desired range. Also, Tech Pan is not really a film that lends itself well to pushing. I have managed to obtain film speeds as high as EI 32-40 with higher dilutions of XTOL and longer processing times, but there is very little benefit in doing so--if any. If it's speed that you are looking for, I would look more towards a film like T-Max 100. I hope that helps.
Michael D. D'Avignon