ZG62 with Mick Reeves Torquemaster 1/1.75 reduction driving a 30 x 10 inch Metz prop

Testing my ZG 62 with reduction for my BUSA 1/3 SCALE Sopwith Pup project. It's doing a 4200 rpm on the ground so in the air it will be in the target range of the 4400 rpm what Mick Reeves recommended.