I wish s had better news but it seemed when I tried bit it would go nuclear for the first hour or so then finally calm down to lower heat output. Here's a thread I started last year to document my experience
Here's the thing about bit, trying one size from one source is TOTALLY different from a different size from a different source (different bituminous coal - i.e. Kentucky lump vs. pittsburgh lump vs. ohio #4 stoker and on and on).
It's hard for the anthracite guys to understand that, they're used to burning anthracite (or even former woodburners) which has little variability. Common anthracite sources that retail coal have very insignificant differences between coals. bituminous coal is NOT this way. In hand-fired appliances, one coal differs from the next spectacularly in it's performance - even when it may look "good" or "bad" on paper.
In addition to this, most appliances are not designed for bituminous coal, don't (won't) work well with bituminous coal, and, add to that, most people "try" the wrong size, type etc. of bit coal, leading to a poor experience with bituminous coal.
If you want to have good probability of success, use a large lump coal, don't use an agglommerating coal, bank the fire, and keep the overfire air cracked open. If that doesn't work, try a different coal or a different appliance.