Your tank needs need time to cycle before you add shrimp. Just adding cycled "material" from your other tanks wont make this shrimp ready. The tank needs time to build up a micro fauna stock that the shrimp eat, and theres no way it could have built up in the 5 days before you added shrimp. Same thing with your nitri-fying bacteria. Also, that chemical soup of clarity/stability/salts you seem to have added may have contributed to their demise...
My shrimp tanks are incredibly simple. Aquasoil and sand, rainwater, simple filter(just floss and carbon), heavy plant mass. I never add chemicals or solid gH/kH booster and my shrimp are absolutely thriving.
I recommend letting your tank establish for a month or two and in that time grow some nice plants and research the heck out of CRS. Patience is key in the shrimp game, and you'll only continue to lose your shrimp and money if you dont establish your tank.
I hope you take this all into consideration, I'm just trying to help a fellow enthusiast enjoy shrimp without all the heartbreak