You sound as if you are on the right track with changes; I'd suggest using an instant read thermometer to be sure it is baked all the way to 212. Here is a recent blog post that might give you some more insight into GF fruitcakes:
https://blog.kingarthurflour.com/2014/11/30/gluten-free-fruitcake/
Happy baking! Laurie @ KAF
December 11, 2014 at 9:12am
In reply to Hi, I grew up with a really lovely apricot and pecan christmas… by Sooz (not verified)