I am sorry to have misguided you Rchardfast. Sounds like it also sums up to personal preferences. I understand the smaller diameter prop will require less rudder corrections due to torque but the sluggishness in vertical is just not acceptable for me.

I like IMAC and have found (at least in IMAC) that it is not a good thing to fly fast. The past season taught me to fly as slow as possible staying true and straight.

Anyway, this discussion has brought me to think a lot. Maybe I will try smalled diameter and higher pitches too...