Yeah usually the Google apps tend to be ok with being installed as user apps.I have 11.4MB free on the System ROM and 234MB free on the internal SD. Is that enough?
I tried converting some apps to user apps but for most of the ones I tried Titanium Backup failed to convert them, 5/6 were successful however.
It's a bit confusing why you cannot get full access to your system partition as the ROM is supposed to come pre-rooted.
I don't come onto xda too often right now as I'm on vacation but hopefully someone here can step you through troubleshooting your issue.
The only thing I can think of is to try flashing the Philz XXLS2 jelly bean kernel again (it comes with a root script).
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