RPM and choice of propel

Hi guys, we are a group having an UL aircraft fitted with a 2003 912ULS. We purchased the aircraft in 2018 but back in 2016 the aircraft was fitted with a new Helix H50F 175 cm 3 blade propeller, a change from a 2 blade propeller. The propeller is part of the listed propellers in the Gerätekennblatt from 2003 and is listed with max. propeller rpm of 2020 (2,43x) i.e. 4900 rpm on the engine, indications are although more close to 4700 rpm. Looking at the rpm specifications in the OM for the 912ULS this seems to be very low. Is that healthy for the engine ?