TEMIN is almost never used so don't sweat it. The only use for the variable is to institute minimum injection time when injector is active. It's purpose might be to inject fuel at the threshold of maf accuracy at very light loads (sub idle) to prevent misfiring at the expense of going silly rich in that are... but... I can't imagine when would that value ever be used on stock injectors which need to squirt 3x as long even at idle - I have no idea why it is even in the programming.

Even at the lightest load when decelerating (just before going VE - no injection at all) I still register more than 0.5ms injection time on my 1000cc very rarely touching 0.5ms. And if I do, the car is going VE immediately.

EPL and the mainstream tuning industry generally frown on DIY tuning and will likely blacklist you if they find out you have been tinkering.