You'll know the first time you try to plane if that prop will work or not. My guess is you'll peg the tach for the first 30 feet and then the prop will get enough bite and be fine after...but if the boat is too heavy then it may not get enough bite to catch.
An easy way to experiment with weight is to go buy 100# sand an try that.
I've run a couple of Laser 2's and thought that they were good all round props.