My previous kernel was .44, iirc.
My N900 ran that one fine, even better on 900mhz.

I hate updating...
OTA doesn't work for me, so flashing is the only stable method for me. This means I have to re-download and re-install all apps and restore all data from a backup.

What are the changes in pr.1.3?

Either way, I'm sorry to hear about your phone being a little messed up, atilla. I hope you're able to fix it soon.