:-( Sorry. I don't know anything about the chipsets in the phones to guess whether the Droid Charge has a Rev. A. option. You might try calling Verizon (long process, I know) and complain nicely about the data dropouts, and see if they elevate you to the next Tier of tech support who might have access to similar stuff for your handset. Or they might do what you suggested at the start and get you into a 3G only device.
With the Verizon CS call centers, it's all about politeness, persistence, and sometimes, calling back later and winding up with a different person on the line. Every time I've started off with VZW on the phone with a "I have this problem and I need someone to help me" attitude and tone, I've had pretty good results.