Packages made for 3.55 don't install using Waninkoko's CFW for some reason, install Kmeaw's CFW if you want to be able to install these packages. If not you can use Rogero Manager.
I used Gaia Manager even while using JB 3.41. Only install CFW if you want to run games which require FW past 3.41 without having to modify eboot files and/or want to go online, otherwise it's just trouble.
I was wondering what Jurai2 was doing around this time with the new CFW and the managers now needing to be signed to work. He's using Gaia. Man that sucks. Dude, you gotta get back in the game.
Don't have the time to integrate the lv2 payload myself. When someone posts code I'll dump it into cover manager I guess but I mean, ps3flow is supposedly coming soon and that will be the best option for a cover view imo. Multiman's cover view has some of the same bugs I couldn't squash. TBH I still like the simple and quick look of sexy/gaia over most other options