Hey Joe.....
I used an APC 14x8 on an OS 91 pumper running CP 30% Heli fuel.
It ran really great and the fuel gives the increased torque for considerably better performance.
If the Intruder was about a pound lighter and had more rudder it would be a lot better but if you keep the speed up it isn't too bad.
Pretty good dollar value though once I got the pushrods squared away.
I used 2 1/4" light wheels to try to hold down the weight.
The Saito should be ok but try that Heli fuel....makes a big difference.