I did not use any nose weight and i was suprized how it maintaianed its cg btw i was 100ft back from it so I could get a good pic of it and it was fired on 4-D12's and it blew the nose I just used some cr's i had laying around I made them long enough to take an E-9 I left alot of room in the BT because of all 4 motors ejection charge so it wouldnt blow out the side
Here's one lifting off with 3 D12-7s about 4 weeks ago. It has flown well twice in that configuration. Then, a couple of weeks ago, it flew great with 3 E9-8s. The only reason we could see it at peak altitude was the smoke and then the big black chute.
Sorry, but it's a bit dark against the trees. You can only see 2 flames, but the third motor is firing.
I did have to put quite a bit of weight in the nosecone. Maybe I was just being too conservative.