Can't say I've come across the bootloop issue, but now that you have TWRP installed let's push forward. I take no credit for posting these links,
all credit goes to BKJolly for his Development on the PacMan Rom, the latest version is the 8/26/13 version 201.7 MB zip,
this is Android 4.3 AOSP, which the PacMan port happens to be the most customizable ROM currently available for the Droid Razr/Maxx HD. In addition download these GAPPs, as ports do not include the essential Apps required to run on ports, this is a link and again
I take no credit all credit for these GAPPS go to SlimRoms (AIO means All-In-One, as all GAPPS available for Android 4.3), which imo SlimROMs happen to have the best GAPPS available for 4.3.
Instructions download the ROM (takes time due to server), then download the GAPPS> move these to the root of the SDCard1 (external storage). Reboot device into TWRP Recovery make a Nandroid backup, then go into Wipe> Advanced Wipe> check Dalvik Cache, System, Cache, Data and then Swipe to Wipe. Once done, go back to Main Menu. Go to Install> make sure Storage: External_sd is selected find the Pac-Man Rom select it, then add additional zips and find the GAPPS and select them. Go ahead and install, once done Reboot System. Congrats! PacMan is installed, run the setup. After, setup is complete go into settings, SuperUser is in settings make sure it is there. Development options should be right above SuperUser, if it is not there, go into About Phone> Go to Build number and press down on it (no specific spot just inside the box) press until Development settings are restored (this maybe a step that is not needed/but nonetheless CM10.2 base Roms have had this problem). Go ahead and Enjoy, you've got 4.3 running on your device something that these Stock and Unrooted users will likely not see on their devices this year!