Hi Wouter

I would stick with the 5% in the saito unless the plane/ engine combo turns out a little marginal for power. I run 15% in most every thing except Webras and 1.2 or larger 2 strokes just because I get it cheap by the case. My Saitos DO respond well to more nitro when I need more power. My Saito 72 especially likes 30% heli which has 23% low viscocity oil. Good for 600 rpm on a 13/6 apc. That's real helpful if your vertical acceleration is marginal. But if your performance is good I wouldn't bother with the high nitro

Denis