Ok... I'll bite. Guess I could use the bounty to get myself a Note and give you guys another rom option...
So first things first. I want someone who knows how to pull a logcat to flash this specific T-mobile T989 modem with odin - http://www.4shared.com/file/GLhtc1O_..._modemtar.html
After you've flashed that modem, reboot and pull a logcat. I want to see what it's doing when it's getting all laggy/freezing. Then we can go from there. I checked the build.props and they are IDENTICAL with the exception of the different phone models/fingerprint (makes no difference concerning data).
Feel free to donate to the cause.