Yes, on starting you should have the thermostat BELOW the room temp maybe 2-3 degrees, that will keep it from pushing more coal and trying to satisfy the temp with the increasing feed rate, but the stove is not up to temp yet and giving a large overshoot, that is probably why you saw the 99 FR. If the room temp was well below your set temp, it will want to keep increasing the feed to satisfy the temp.
When starting, It has to burn up what' on the grate and get some ash, so it may get hot for a while when you first start it, but after it settles down, you can bump the temp up to room temp and let it settle. Don't go more than a couple degrees at a time to let the stove catch up and settle into the new temp setting. Changing it often doesn't give it time to settle on the new settings.