I would transfer. It seems like you're capable of doing well, and a tier 2 is more often than not going to give you much better placement/salary, etc. Both schools will be 'regional' in a sense, but the tier 4 is more likely to be a 'city' type of regional, while the tier 2 will probably carry you across whatever 1/4th of the US you're in without too much trouble. I'm basing this mostly on my experience with schools in Oregon/Washington, and from others input on LSD - so take it with a grain of salt.
I would transfer.