The first batch that came out of ibolt didn't force the phone to go to AC Charge mode, contact them, they'll send you a free replacement.
You can confirm that is the problem by using the Battery Monitor Widget app, it shows if the phone is in AC or USB mode, it should be in AC or it won't draw enough power to keep up with the phone. The bottom line is the data pins on the USB connector need to be shorted so the phone knows it's not plugged into a computer USB port and that it can draw more then 500mA of power. The first generation of the dock didn't have the pins shorted.
Craigsdock is a very nice option, my only gripe with it is once you lock down the position of the USB connector, it's not easy to move, I like to use my phone with the extended battery occasionally, all I have to do is swap out the plate in the ibolt dock and I'm good to go.
HTC Rezound - S-Off - Ineffabilis Deus v1.2/Funky Kernel 3.3
Kindle Fire - CM10.1/SGT7