Failed moults are usually associated to Calcium content in the water. That is, your GH reading.
Too much GH and the shells (and eggs) become too hard and moulting becomes difficult. The shrimp looses too much energy trying to moult. Too little and their shells don't develop properly causing deformities (maybe GH under 2).
This is a long term affect, that is, if you see it, it's already too late and nothing you can do to help a shrimp that is having issues right now.
I'm not sure there woud be much you could do in that situation, hopefully someone else may have some ideas! The stress of the moving added to the waater change and the mout is likey to be too much all in one go! Even without the obvious moult I woudn't personally expect all the shrimp to survive and usually a few disappear/die in the first 2 weeks! If you got them from a shop they have already beeen through a lot going from the breeders tank, transit, into shop tank (different water probaly), transit, into your tank (again new water) at the very least, there could even be another wholesaler to add to that? I always used to buy direct from hobbyist (ebay) which meant just going from their tank, transit (post), to my tank, but even then I usually lost a few in the first 2 weeks.
I did once see a youtube video where someoone helped a shrimp moult by using tweezers but that is very fiddly, you would need to fish the shrimp out and put it into a smaller container, and it likely still wouldn't work, even if the shell were removed it may die in the next few days from stress.........
If you try anything please let us know how it goes! Hopefully some others will have some ideas?
On the ratio issue, most people would prefer more females to males as you only need the one male to breed with the females and you will get more baby shrimp the more females you have! There is probably another issue if they aren't breeding and you have both sexes?