Thats the first boot loop on the 672 Ive ever heard of! Ahaha
You could quite possible have a super Lazy Ascend. As of now I got nothing except try some other builds. Maybe your phone just dont like the new build.
Try one of BobZ's builds. Their CM7.1 Android version 2.3.4
CM7-Ascend-BobZ - Prepaid Android
Theres also the option of trying CM6