I bake at 220 F. First, you need to make sure the oven is at temperature before you put the piece in. Most ovens ramp up fast, and unless it is a convection oven you will burn thin pieces.
Make sure your armature is solid and can hold the sculpt without flexing. When polymer clays bake, they become quite rubbery and will crumble easily. Also, parts that have been cooked with become rubbery as well so don't count on them to support your piece.
And if you have used CA glue, it can soften at this temperature and loose its adhesive properties. I have had the thin CA glue actually go back into solution and glued my fingers together when I wiped away what I thought was water on the piece.
If you have very small parts like horns or fingers, you can also cover them with foil to reduce burning them.
Don't get too stressed about discoloration. I accidentally left a piece in the oven over night. It turned black but after priming, you couldn't tell there was a problem. Actually, when you are complete with the piece, I would recommend cooking it for a long time until it turns almost carmel color (regular SS, not the sculptors grey). It will be very hard and durable. Cooking to short can make the piece crumbley, but easier to sand, so keep that in mind.
Lastly, I would suggest you turn the oven off and let it cool before trying to move it. That's when most breakage occures.
But if you want to part the piece out, you can make perfect cuts when it is hot with an exacto blade an it is like cutting silicone. This works great if you have already cut the armature an you are on the final bake.
BTW, I usually bake my piece many times before they are complete.
I fogot to add, be carful using a heat gun. If you get it too hot too fast you will cause it to blister and you will have to dig them out and fill it back in to fix it. Sanding won't fix the problem because it they will resurface if you bake it again. I wave my heat gun back and forth while heating to avoid over heating the surface.
