If you don't like what you see on the tach, let me know because I just got done with my 2nd conversation with the prop guy where we've landed on his suggestion being a tiny diameter 4 or 5 blade, pitch TBD (he has an idea, but the plan is to find a used/demo prop between the 2 of us so we can throw it on there and see where we land.)
12.5" 5-blade would certainly fit within what he told me to hunt for.