I did a dry rub on this one and used the Dizzy Pig spicy beef rub, kosher salt and a small hit or garlic and onion seasoning. Put it on at 11:30AM and kept the mesquite smoke on and the grill at a solid 250 on the grates till 7:00 as the tornado sirens were going off and the hail started. My timer and the sirens both went off together and i pulled it at 185 degrees. Double wrapped in foil, beach towel and set it in the cooler for about an hour and a half. At this point the smell overcame me and I had to cut it open! I had lost sleep over this thing thinking I was going to ruin a $40 cut of beef!! To my surprise I got it right, very right. After the carnage of the meal I had three slices left for a very thin sandwich for my lunch the next day.
As for mods I used the dryer tube and extended my exhaust to the grate surface, and I also flipped over my charcoal tray to make a baffle. I over heated the charcoal tray in the SFB and it warped, so I will be making a new one of those shortly. This thing did eat the fuel, I went thru a bag and a half of charcoal.