Another thing to consider too is that just because your draft is strong, in my opinion that doesn't necessarily mean that it's yanking heat away from your stove. I can see the eyebrows lifting lol.
In a stove that seals well, there won't be leaks that bring in unregulated air that will be used as a vehicle to carry heat up and out of the chimney. In this situation the only air coming in is controlled by you, no matter how strong the negative draft pressure is, at the primary and secondary air controls and is designated for combustion. We get the following equation:
Combustion air going in = combusted coal exhaust going up the chimney + some heat.
In a stove with faulty gaskets around the load door or at other seams around the combustion chamber, a stronger draft will pull more air thru the stove at these places that WILL be used to carry heat out the chimney. In this situation it would be more imperative to have a weaker draft. Here, we get an equation that looks like this:
Combustion air going in + leaking air going in = (combusted coal exhaust going up the chimney + some heat) + (air that did not serve anything productive to combustion + more heat)
So there ya have it, how I see it
Pardon the run on sentences, results may vary.
Edit: I did some clarification...