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Correcting the water parameters now will only have an affect at the next moulting phase. So it's not going to be immediate. It won't hurt feeding a bit more than usual if you suspect there is not enough food. So go ahead and try that.

I have been able to get my tank down to around 170 TDS and 6 GH and 5 KH. I will continue to try to lower it a little more but it seems whatever has been making the KH go up has stopped. However I am still finding daily shrimp deaths. They look like juvenile/young adults now. I'm completely baffled. I am also seeing some molts in the tank. So some are making it and others are dying, assuming it's molt related. Barring any diseases, pathogens or parasites (nothing new has been added to this tank), the only thing I can think of is that my tank population is naturally capping out. The strong are surviving and the weaker are dying. I know there is plenty of bio film in the tank but maybe what they are naturally foraging is not enough nutritional wise and the food I do add is not enough to go around. I picked up some Hikari crab cuisine which is made for inverts and should be calcium fortified in case it's molt related. I'm thinking maybe I need to feed them more quantity and more often? Am I even thinking this through correctly? I've been a bit stressed out with the daily shrimp deaths.