it's all quite strange...
I didn't get lockups, X crashing or Z not waking up from a while now... actually I have not serious stability problem since last 3-4 release candidate.
Since you are using a different machine, whose support is very recent, the only thing I can say is that:
1) probably you'll have the same satisfaction I'm getting from this ROM in the next future
2) everyone is usefull for developing process, but no one should sacrifice his device for development without the right serenity
I feel very good when using pdaXrom, because I know that without pdaX my Z would be a simple, bad working pocketPC. I'll give pdaXrom all the time and the trust I gave until this moment, because now I can say that it was well-spent.
If you don't feel like this, you're right: go back to stock rom, and try back pdaXrom when support will be better. You'll be an usefull development-helper that day.
Anyway, remember: I had your condition a few release-candidate ago... now I'v got a linux table pc I can put in my pocket - not more, not less.
Good luck