I agree with Bob Whitney on his comments about tip weight.
I have no issue with Chuck Snyder's experience and comments about using no tip weight. He has plenty of experience and is an accomplished builder/flyer. However, some tip weight cannot hurt anything.
If your model is coming in at around 6 pounds (96 oz!), a bit of tip weight would not make much difference. So the question remains, how much? Typically, a full size stunt ship (550 to 650 sq in and 50 to 60 oz) will have maybe around 3/4 oz of tip weight, more with equal span panels. (Just a note about dihedral on stunt ships - dihedral does not affect performance on stunt ships. But there is a problem in high wind on the up wind side of the circle but this is a whole other subject.)
On my small 1/2 A multi-engine scale ships, 36 to 42" span, 30 oz, I build in as much as 1/2 oz of weight. On some larger scale models, 40 to 50 in span 40 oz, I will use as much as 1 oz. My Martin Baker, .60 powered, 42" span, almost 5 pounds, I used something like 1.5 oz or more. On your 6 pound model, I would recommend at least 1.5 oz. It cannot hurt and will help keep that outboard tip down on the upwind side of the circle. In my opinion, for a scale model one needs to compensate for more than just the weight of the leadouts and the amount of line weight that the inboard wing is supporting, particularly with a wing with any amount of dihedral.
Keith