Yes, definately more females. With this species (Unlike Sulcatas), it's fine to have several of both, both for fertility and breeding it's fine. I have 2.8 adult Leopard breeding group and my males seem quite content with that many girls lol. They are doing the job, although if a larger male came up, I would probably get another male. Also, males are smaller with this species and my males get the job done.
It seems in any case, having more females will yeild more hatchlings than having more males.
I think size compatibility plays a big part. If you had one small male with a bunch of big females, they may not produce as many viable eggs as a 1.1 pair that are of similar size to each other. In a lot of cases female leopards will grow bigger than males, but not by much, so finding adults of relativley similar sizes will be your best bet.