What do you mean by you "loaded a slightly modified version" of fresh 1.1? Did you load fresh and then modify it yourself? If so, what changes did you make that may affect the battery?
As for a Radio Update, why do you think you need it? Is your signal strength not good? Have you done any investigating to see what is using your battery? Apps like Spare parts will tell you what is keeping your system awake, which is where I would suggest starting.
If there is an upgrade for Fresh 1.1 it is not on his download page. I remember seeing one a while ago, but don't remember if it was for 1.1