Just getting back to you - I have had my MSL for months now - that's how I changed the prl in the first place. And as a user had noted - the monster script is what I used to put the phone in dm mode. Basically the steps I had taken were as follows:
1. Run the moster script to put my phone in dm mode - obviously it works, because CDMA workshop would not connect to it if it wasn't.
2. Go to security tab and select the Samsung default password, and click send (I believe) - the program responds, telling me that the phone is unlocked
3. Go to "other" tab and try to write the prl. And there is my dead end. Several other threads do not mention needing your msl when you are running a custom rom. And as an aside, I odin'd back to stock and tried changing my prl, using the msl and ##8778# deal... all to no avail.
But again, thanks for your replies. I get decent reception in metro areas, but was looking to possibly help my situation at home, where all the trees impede my signal...
Upon some further research, I think it is my laptop - the COM ports mysteriously disappeared from the device manager... I need to run the BIOS and see if they are enabled... if that makes any sense...