Hi stickthin2k and welcome
.
I also have very soft water, and unfortunately experienced the same thing in the past with keeping Amano shrimp at a pH as low as that - in two separate tanks.
My advice would be to try and put as much tufa rock (or similar rock from the LFS) as you can into the tank, if you don't like the look of it, bury it in the sand or gravel. Even put it in the filter.
This will raise the pH, GH and KH of the water to suit the shrimps needs.
Adding liquid calcium didn't seem to help much for me, but if you can do so, it's probably worth a shot on top of raising the other stats.
Right now I successfully keep Amano and other shrimp at pH 6.6-7 (depending on time of day), GH 80ppm and dKH <2.8.
That is with coral sand mixed into ADA aquasoil underneath playsand as the substrate, and about 5 small pieces of tufa rock at the back of the tank.