Hi,
The cold water is higher pressure as it come from a water tower high in the air, but your hot water supply comes from your hot water tank in the house. So obviously as the hot water tank is not as high up as the water tower the hot water will be lower pressure.
Therefore, 2 options:
1) get a plumber to install a small electric pump on the hot water feed.
2) Get a shower that only has a cold water feed, and heats the water itself. I have a Triton one of these and it works fine.
Lest
October 2008