Hi there! Forgot to answer you on Amibay so i'm doing it here. I suppose there were some typo's, so the right line to add to your SS is indeed this one:
C:ACATune -maprom Devs:kick31 -cache on -burst on >NIL:
You already have a "kick31" in your DEVS drawer as far as i know so this is just fine
As for the cold/soft reboot "problem", i must admit that this happened also to an A600 (with ACA630) and quite the same startup sequence configuration. I think that this has to do with the 3.1 remapping but i couldn't think of anything else and of course i don't know if there is any way of avoiding the soft reboot So, i couldn't actually answer to this and propose a solution but i suppose it's no big deal so you could live with it as long as the board is working fine