Interesting theory. But I haven't seen this on my phone. Maybe i just haven't paid close attention enough? I'll keep an eye out for that.
Thanks for putting a percentage on the improvement!
However, I think it probably ends up being even better than that, because my phone lasted the WHOLE day with 2.2.2 with the stock battery.
With just Basix, that used to be 7 to 8 hours, and that was a good thing (4 to 5 on stock 2.2.1)...
Anecdotally, Basix seems to still last longer now (almost a whole day), so you might be onto something about the radios...
Unfortunately, I don't have the old radio files... I never had them, so even my backups are the newer modems.
If someone has the old version of the modems, (pre EG06 and EF23, please PM me, and i'll walk you through the process of extracting them for sharing... Being rooted would help, but is not necessary.)