Susan Purdy did write 'Pie in the sky' which is pretty good for reference. I happen to live in between her testing zones however. (6035 ft) Generally speaking add about 2 TBSP up to 1/4 cup of flour. Reduce the sugar by about 2 TBSP per cup. Reduce leavening by 1/8-1/4tsp. Pre heat the oven hotter than what is called for, and then immediately set the temp to the recipe. This helps to stabilize the baked item.
Hi Rachel, I'm pasting this here as well for others' reference: I'm sorry to say that I don't have any high-altitude baking tips (and Genius Desserts doesn't tackle high-altitude modifications). I know how complicated it can be so I think it's best to refer to a dedicated expert, like Susan Purdy—are you familiar with her work? Here's her site: http://www.highaltitudebaking.com/
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