Resist the urge to tinker with the stove. Tinker with the tinkerer instead. 600-700º is where the stove likes to cruise. Next fire try to turning down the air sooner, use thicker splits, packed tighter. But leave the stove air supply alone. If you really want it to run cooler start a smaller fire and every few hours drop on a couple splits. You don't have enough fires left this season to learn how to run the stove well. It is quite different from the Keystone. Give it time and relearn the burn.