i have been flashing roms for about 2 yrs now...and a long time ago on xda forums a dev told me to wipe 3 times (when i had my mytouch) just to be sure. i dont know why but i have always had very little problems if i do it that way. i dont like rom manager because it dont give you that option. the 2 times i used it i had issues with the roms. easy fixes though, but annoying (like the problem you had). so i always reboot into recovery, wipe all three , 3 times. (delvak,cache,and system). do a nandroid and try it that way and manually reinstall ur apps and see what happens. there is nothing like a fresh install of everything...for some reason speed is always better that way. if it doesnt work ...no harm done just restore nan backup and your back to where you are now.