I hate to add to the broken record, but I've played Rain a lot against Krayzie, and I don't feel it's nearly as bad as the other 7-3's that you listed.
I mean look at
vs Reptile
vs Baraka
vs Stryker
vs Jade
Those matchups feel SO hopeless, with Rain at least:
1. He builds meter for breaker really fast.
2. He does TONS of meterless damage so he can save his meter for breaker. It also causes Cyrax to use breaker more, so he can't save as much for resets.
3. On reaction from fullscreen, lightning and teleport aren't too bad against net, so it isn't that free from that distance.
I think it's 6-4 really, you just can't say it's on par with those other matchups.