You might have to find whatever times you can find, in whatever developer, and then cross-interpolate by looking what other similar (cubic grain of similar speed) films do inT-Max 1+4 compared to whatever developer you found times for, to get a starting point, and you may have to do a couple rolls to adjust your time. Once you find a good one, be sure to let Digitaltruth know so they can add it to the Massive Dev Chart to help others.
I'd probably start by looking at the times for FP4+ and Fomapan 100, or HP5+ and Fomapan 400 as "comparable" films. Kentmere 100 and 400 are also comparable.
Here is the time for Rerapan 400 from the Massive Development Chart :
ReraPan 400 TMax Dev 1+4 7 mins at 20C. Nothing for 100 but as Donald says look for films at 100 in TMax developer and use that as a starting point
Thanks for the edit, brain jam, I guess it must be the booster fault . Ok cool, I'll try the massive dev settings, and try the FP4 as well. Found out today that my jobo reels won't spool for 127, maybe need a Patterson tank for this, any suggestions