Here you can find many of those answers that you're asking you have to be patient and read. One I first started I spend a lot of time reading and actually playing around with the phone until I got the settings I like.
http://forum.ppcgeeks.com/showthread.php?t=42730
Here is another link for the radios
http://forum.ppcgeeks.com/showthread...ultiple+radios
Link for the PRL
http://forum.ppcgeeks.com/showthread...&highlight=prl
I would suggest to update the radio and PRL as far as your performance of incoming calls and best signal.
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