if you are getting reboot or force closes I can almost guarantee that you didn't do a full wipe or when you restored with Titanium Backup you restored system data in addition to the apps.
I ran Oxygen for a week when I was reviewing it for the site and I never had one issue. It was smooth, stable and quick.
When I say full wipe I'm mean both 'wipe data/cache' and 'wipe dalvik cache'
If you are still having issues, reboot into recovery and do the wipes in there. Make sure you hit Dalvik, it's in the advanced menu.