Help figuring out what I'm doing

Toast

I've used this recipe for @ 3 months and it has worked fine.  Stays in the baking pan.  2nd rise is almost same height as 1st rise and make a decent sandwhich size loaf.  Last time I increase the yeast to 1-1/4 teaspoons and 2nd rise collapsed well below 1st rise level and made a very short loaf in terms of height. 

This morning I went back to the original recipe I had success with and it collapsed on me again.  No extra yeast this time.

Appreciate any help.  Brian

Dry ingredients:

1-1/4 cups brown rice flour

1 cup buckwheat flour

1 cup tapioca starch flour

1 teaspoons of xantham gum

Wet ingredients:

2 large egg whites (6 tablespoons of egg whites only)

1 teaspoon salt

3 tablespoons of brown sugar

1 teaspoons of apple cider vinegar

¾ cup almond milk

¾ cups of water

 

Then you are overdoing the proof. Go easy on how much it rises before baking. Also, this is a gluten free bread. No need for two rises. Mix, allow to rise but don't overdo it and then bake. 

I can adjust the cycle to one rise, but not sure how I control how much it rises the 1st time?  Less yeast, less/more water, less /more xantham gum ...

Thanks.

Brian