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It seems like this should have been discussed and answered already, but I can't find it here. I have a 1984 15 Super Sport with a 1994 Mercury 3 cylinder 60HP ELPTO. Currently has an aluminum 10X17 quicksilver prop. I don't have a tach, but top speed with GPS I've seen with only me and a little bit of gear in the boat is about 37mph. When the boat is loaded with 2 adults and 2 kids (450LBs of people) it's a little sluggish getting on a plane and top speed is around 30mph. I've seen discussions about a 70hp yamaha that generally suggest a 13X17 or 13/19, but I see the ratio for Yamahas seems to be very different than that of Mercs so not sure if that suggestion applies.
My goal would be to get out of the hole fast with reasonable top end.

I was thinking maybe I should get a tach first, but then started looking into the accuracy of tachs and it seems they can be pretty inaccurate anyway. I wanted a tach with a white background and an hour meter.

Any suggestions or experience with props for these Mercs?