brian, I do not have one, so can't speak from absolute experience on it, but, from my days of using FBR's.
Up the loft a little bit, lower the heat a little bit, yes it will take longer to roast but won't be pushed so hard. Also don't be afraid to get it cracking, lower the heat a bit, HOLD it there for a minute or so to let it stew..for lack of a better word in the crack zone, then whump the temperature to push it thru and over.
Another trick i have used before, oh god over a decade ago on my Redneck Roaster, run it straight up into crack, then pull heat way back to essentially stall it a few degrees after crack started.
In other words lets say a roast begins crack at 400 degrees, and first crack ends around 415 degrees, and at 420 is where second is going to start coming in.
Push it thru, hit 400 it's cracking, VERIFY it's going and not just a rogue early bean, then pull it thru to say 405 degrees, and then pull the temp way back, even if you undershoot it and have to kick it back up,but keep it at 405 and let it do it's crack thing. You can smell and hear when it's winding down, when its getting done, up the heat to push it thru fairly quickly now, since your roast is essentially done.. thru to end of crack, , then go into cooling when you feel it's where you want it.
It's hard to explain w/o actually having one or being there with you.
You need to get your ass down to jax, bring your roaster and we'll spend a weekend roasting coffee, going fishing and making a video of our mis-adventures !
Aaron