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If your hot water pressure is gravity fed (from a tank in the attic) though, you may have just reduced the distance between your shower head and the tank which could cause the drop in pressure.
@ReekBlefs you can test this theory by holding the shower head lower down. If the pressure is good at the bottom of the bath but terrible when held towards the ceiling, that's what it is.
For the flow rate, check you haven't doubled up on flow restrictors or left one in that you don't need. If your hot water pressure is gravity fed (from a tank in the attic) though, you may have just reduced the distance between your shower head and the tank which could cause the drop in pressure. This could explain the sensitivity to adding cold in.