It looks like the problems are resolved. I ran reiserfsck on all the data drives and there were two that had issues: disk 1 and the cache drive. Before I even knew there was a problem with the build I had transferred some data from the cache drive to disk1, so it was not a surprise to me that both of them would need fixing. Other than that, it looks like everything is running smoothly. I'm currently running the preclear script on 2 1.5 TB drives, I can't believe how much faster it is than my old system!
I'll attach another syslog here, I'd really appreciate if RobJ could take a quick look to make sure everything is ok. I think it is, but I'm far from an expert when it comes to reading the logs.
Thanks again for all the help, it made the process very painless and greatly minimized my chance of data loss.