Barry.
I have 2 of these CAP's. One with a OS 52 and another with a Saito 72.

Yes, they tend to be tail heavy, but instead of putting dead weight on the front, move your Rx battery on top of the fuel tank.

Make sure that it is secure there and doesn't move.

I had to add almost 2 oz. of lead with the OS 52.

The manual says that the CG should be 3 3/16" from the L.E (close to the fuselage) measured with the plane upside down.

Make sure that the CG is correct or the plane will snap on high elevator rates.

Happy landings...