Well after trying every mod for phpBB I could find to try and slow the spammers down, I finally made myself sit down and change forum scripts again. I did figure out the permissions problems I was having the last time I switched, and everything seems to be working now the way it should. Like before, it appears that everything has ported over correctly but it does appear that we are missing a few older posts.
It is going to take some getting used to for use all, but SMF offers allot of enhancements over phpBB "out of the box".