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It's certainly a good idea to rebuild the carbs, as you did, when you buy an older motor with an unknown service history. That does not rule out a carb problem now, but it makes it a lot less likely. It will be interesting to see what the mechanic comes up with.

With my F70 it took me 4 tries to find the right prop. I tried the Stiletto Advantage 1 in both 13 and 15-pitch, and the Stiletto Star in 15-pitch. I settled on a 16-pitch PowerTech SCD-3 - with less blade area, it seems to be a much better match for the peaky F70 than the large, grippy Stilettos. Depending on how fast your 15 is, and with what loads you typically run, you may want a 17 or even an 18 pitch in the SCD3. Running alone, I can hit the rev limiter if I trim out enough. I typically can't go that fast in the conditions I am in, so the 16 is perfect - lets me hit close to 40 with only a tiny bit of trim, and acceleration is very strong.

One other prop to mention is the Turbo Quest - they advertise it specifically for the F70 and it looks to have some of the same characteristics of the SCD3, namely low rake and smaller blade area compared to some other props. An advantage of the PowerTech is that as you are experimenting, they'll let you trade for another size prop for a nominal fee.

Tim