I'm not sure what the root cause of the flash failures is, but it's not exclusive to this package, mdj used to do it for me as well, that's why I mentioned flashing 2-3 times for good measure, only take m takes a few minutes
To those who wanted the modem, I can add the link to the OP if you'd like, just didn't want the post getting too messy.
[edit] And to be more specific on my history with XDA, I've been here since the G1 launched way back with the creation of android, and I've always wanted to take the time to learn and contribute, but I've never had the free time in life to devote to learning it at more than an intermediate level. At the highest level I could modify custom rom pacakges for the S1, and that was about it. I've always tried to contribute where I can, and it just so happened that I've been able to source builds for here-to unreleased upgrades at this point. I generally only post when I feel I have something to contribute, or to say thanks to someone who was useful in some way to myself, and my post history I think is pretty high quality... My last contribution was about this time last year, and was an easier root method for the XT925/XT926 running jelly bean, and before that I tried using another connection to contribute some source binaries from the HTC Sensation to people who could do far more with it than I could, Hell, I even offered up the device (Eventually bricked it trying to screw around instead.) to anyone who could do something with it.
I do what I can, because this place enables me to do what I want.