Mike, what are you using for a horn driver in your Leslie? That can make a big difference in how the Leslie cuts through in a live situation.
My Leslie 122 has had a Peavey 22A driver (8ohm) in it since I got it almost 10 years ago. I just put in one of BT Productions new drivers that are real alnico like the old Jensen V21s but can handle 100watts, so you don't have to worry about blowing them. Man, what a difference!!! I haven't used it live, but that Peavey has always had a really screechy high-end. The BT Productions driver is nice and smooth in the top end and not harsh at all, but still just as bright.
I put the Peavey in my 21H, which is where the BT driver was. It actually sounds really good in there, because my 21H is very dull even with the BT in there. I think the crossover needs to be rebuilt. So for the time being, I'm going to keep the Peavey in the 21H and the BT in the 122. I'll see this weekend how the BT does live.