I gave up. Just rooted first time yesterday... bumped it all the way up to CM10.1 24th nightly (Android 4.2.1). Will never go back... can't believe I've been missing out for soooooo long. Cyanogenmod on the xoom lte is awesome. Never thought I'd have a use for the multi-profile login in 4.2.1 but after tinkering with it and heavily restricting the addl profile, now I've got a perfect walled garden for my little kid. No need to worry about deleting emails or widgets, etc!
In case anyone's wondering, here's the right recipe to take you all the way to the bleeding edge (mixing and matching is the only hard part... once the versions play well together, all is good):
cm-10.1-20130124-NIGHTLY-stingray.zip (likely a new nightly by the time you read this)
gapps-jb-20130105-EOS-XOOM-ONLY.zip
recovery-clockwork-touch-6.0.2.7-wingray-signed.zip
PS - the OTA updates w/ CM were the kicker, if it's broke today it'll be fixed tomorrow. Even better with CyanDelta......