I got the Saito 1.30 twin sorted out today, I chose a 15x8 as the better prop, Saitos recomendations are a little light in my view.

Prop==Graupner 15x8
Fuel==PowerMaster 15%/18% syn/castor blend
Plugs==(4) Fox Miracle plugs
Top rpm===8,390 one click rich each cylinder
Idle 2,370, no glow power.
Two Cline regulators this time, much better. Also used pressure from both mufflers, I have the stuff so why not.