Uh... That's not .230. That's the hybrid, 50v7.6. You still need the original 5.0.0.230 installed to use the Tour hybrids, and the latest one is missing some features (such as PRL update).
After installing .230, I was averaging around 5 minutes for a few weeks, but lately it's fallen back to 7 minutes or so. I haven't really added additional apps that wasn't on there when I was getting 5 minute boot times, so I don't understand it. I do have more pictures on my external memory card, maybe that's the cause of it?