This totally worked. I'm now running the 61677 hybrid PRL! Thank you ever so much to both freddysam, for figuring out most of the details of the process and for making the hybrid PRL, and to rjones1981, for figuring out the last critical bit that was fowling me up.
It's already very clear that I'm getting better signal within my apartment. I guess I'll see over the next few days how much better things are overall.
Oh, and freddy... I'm completely with you on blaming Windows for this. Windows, or possibly Canada.