After a few hours of fussing, you'll have yourself a great little heater! I'm always amazed at how much fly ash ends up inside the pathways. I use a piece of flexible plastic conduit to snake around inside the cleanouts - just don't get it stuck or it'll cost you some skin!
Get an old carboy brush and that works well for knocking down that f-ash by snaking that down behind the back thru the stove pipe hole and a smaller brush to snake inside the side's top firebox exits.
I run my stove at max, I'd say 600-700*F, most of the time. My front grill sags too. I replace it about every third year or so. I think the last one cost me around $65. There's a tremendous amount of heat that radiates out of the front doors. After all, your'e looking at 6-8" of the side of a burning pile of anthracite!