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I think that makes sense - the cold water tank is in the floor above the shower, and the hot water tank is on a level with it, so presumably the cold water has greater mass by comparison because it benefits from gravity.
The shower didn't come with a flow restrictor but I've just bought a set so I can put it against the cold tap. Had no idea they existed - thank you!
ReekBlefs
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.