On the Neu 1110 setup I'm running an RFM 16x10 (~5K' altitude) which gives me ~70A on a 3S and the neighborhood of ~110A on 4S. It climbs well on either setup...but 4S is all I fly
The local club guys seem to mock me quite frequently as most have optimized their ALES craft for minimum weight and 200m/30s criteria.
The 16x16 will IMO put you more in line for fast flight speed, not the thrust we want for these models. I bet your pitch speed would be 3x or more than the flight speed of this thermal airplane (i.e. useless amperage) and will prop stall on launch if you have throttle-toggle. You'll get more thrust, efficiency and enjoyment from a less pitched prop spinning faster.