@galaxis I have the best luck making my own flour blend for baking, though it might make for a heavier loaf (this works well with things like banana bread, cookies, etc at least)...
1 part rice flour
1 part tapioca flour
1 part potato flour
1 part chickpea flour
Dash of Xanthan gum
Could adjust the ratios to experiment, also I learned to not confuse "starch" with "flour" as they have pretty different properties.