well as im beta testing an app right now i had to go BACK to 4.2.1
however, i reinstalled everything fresh and didn't use my backup, everything seems to be running ok.
i forgot my own golden rule.
don't restore from backup when updating your firmware. unfortunately that means i gotta download like 600 mangas all over again.
Cydia is still a little flakey but overall, i can live with the mionor issues now.