The scheme list would need some balancing anyway. You can say we have 4 ropes and 4 defaults but a better classification would be rope, default and bng:
rope: WxW, TTRR, Roper, (Shopper)
default: Elite, Team17
bng: BnG, (Hysteria)
3 pure rope schemes, 2 pure default schemes and 1 pure bng scheme. A half rope, half default scheme (Shopper) and a half bng, half default scheme (Hysteria) on top of that.
An easy fix would be to put Roper and WxW in one scheme class, perhaps this way:
Roper / WxW*
*Roper is the default. If both players agree, you can play WxW instead.
Roper and WxW would have shared season class but separate overall ratings (when you play WxW, you gain/lose season points based on the opponent's WxW overall rating etc).
I don't think merging Roper and WxW is enough if you want to even out the playing field, though. TTRR is still too much for bad ropers.