deleting is not necessary. Unless they conflict to each other but alas no.
I have MultiMan 1.13 (latest version as of posted), Open Manager and LV2 v4 patch installed. They work flawlessy.. just execute them seperately...
if you want to use MultiMan then dont use Open Manager and LV2 v4 patch.. If i want some discless game, i just restart my console and load LV2 first then Open Manager.
I only use MM for some games like Ratchet and LBP since they were having some PL3 common freeze issues. Other games are booted via LV2 v4 patch with the help of Open Manager.
btw... Sonic and Sega All Star Racing does have more than 12000+ files.. so its normal that it would take a few more time than any other game. And it requires an update file to work (which is not possible for now, since there's no payload fix yet for Game Updates like in 3.41). But you can just patch the eboot to make it like a PSN game so you can play it on your 3.55FW
Model: CECHC04 PAL/EUR 60GB SKU Console
Firmware: REBUG 3.55 CFW [DEBUG MODE, DEBUG XMB, MENU OPTION 2]
BM: Iris Manager v1.2 (Hermes Syscall8)