Yeah I agree. 1.1 is riddled with bugs and I didn't even know it even worked at all on the 84+.
Also (although personal opinion) Doors CS7 has pretty much obsoleted MirageOS by now. You can run ASM programs directly from the home screen like BASIC ones and the file size on a 84+SE doesn't matter much considering a 84+SE has 1.5 MB of archive. It also runs xLIB/Omnicalc games.