I don't know about the Rohms Alan but my SAM is set on about 520g which is the weight and 3 x 2 pence coins. Nothing worse than getting to a comp and failing due to an over sensitive trigger and a heavy handed tester
Rohms are not a bad match pistol for the money but I don't class them as a "true" match pistol so you're unlikley to get extreme fine tuning.
Bob