Thanks for the kind words
I'd roast the Koratie separately, and do not let it enter 2nd crack. Since you're blending, try 7oz on the 1/2# setting. )1/2#/P1/C....but stay there, about 1/5 to 2 minutes after first crack, start the cooling process. Open the door 2 minutes into the cool, and leave it open.
Even though the Sumatra is a harder bean than the Brazil, the Behmor is noted for evening out roasts. Roast them together. 8oz Brazil, 6oz Sumatra If you have it) If not, maybe some Java, or Sulawesi.(these 3 are less acid, more lower end flavors to balnce the koratie's fruitiness) Try this profile for the 2 bean combo. (1#/P2/B) Even though you said you like your coffees FC+, stop this roast as soon as you hear a couple of snaps of 2nd. Brazil gets ashy if it's over-roasted. When you are ready, the next step would be to add a wee bit of a Central American, such as El Salvador, Guat, etc. I like Yemen in mine...yum.
Note:...with the Behmor, when using the P2 profile, 1st crack is more subdued than with P1, so listen closely. In the middle of 1st, I like to open the door for about 2-3 seconds. Helps stretch the roast, as for some reason P2 roasts can sort of drift from 1st right into 2nd on some varietals.
Some folks would roast the Sumatra and Koratie together, but I like this way...YMMV.
Last thing...do you have both roasting drums? The one with the slightly smaller grid is better for smaller beans like the Koratie, while the other drum allows more hot air to circulate, great for the larger beans.
When your done, you should have right around a # by weight.
keep us posted. I'm fine with this thread moving around a bit!