The distances will change a bit but I personally do not aim diffrently. What is most important is your form. Draw your bow and bend at the waist instead of dropping your bow arm down. This will make the biggest diffrence in shooting from a tree. If you drop your bow arm your form will change, anchors have a tendancy to change and the arrow dosn't end up where you want it to.

Hopefuly this will make sence. If not say so and I'll try again