[DenverDev]

A) I am no expert but have been doing a huge amount of research, in general, and these are my thoughts....take them with a grain of salt and keep searching....
B) If you flashed a carrier specific Verizon Rom, the carrier cab and at least a base prl should have been included when cooked in the kitchen...
C) If justthe data wont work, I am thinking that you may have to re-authenticate your device for data. Unfortunately I only know how to do this for Cricket (get into the epst settings and then security, verify the number@somethingaboutverizon and whatever the verizon password is...for both (4 total fields)......but as I said this is all I know..

HTH