Oh my GOSH that is hilarious! I went on the forum looking for some feedback on the BB. I just finished Rocksim'in it out and the weathercocking is unsafe on a C6-0 even in light winds. I was wondering if others found that to be the case in real world flights. Looks like that's the case. I really didn't feel like moding anything this time, but there's no way that C6 will work. I think I'm going to mod the booster to 24mm.
I was afraid if I stayed with 18mm on the booster it would get about 20' up off the pad, turn 90 degrees and ride off into the sunset like your video shows!
That happened to me once before with the Custom Lightnin'. The Lightnin' was a long, kinda' heavy, two stage, 24mm, but a D12 just couldn't lift it fast enough. Even on a calm day, she went up, turned right, and said bye bye! Never saw it again.