Difference in props

[stickerhard]

I have a 15 fiberglass V Hull ...Magnum is the name of the boat I dont know the weight and I have a 1979 80 merc on it.Boat planes great and wot is 5500 rmp's.I want to stay at the rpm's I been trying to figure out the difference in the solas SS prop and a Stiletto Advantage SS prop. I know SS get out of the hole faster and gain a few mph top end.Could one of you smart folks have any advice on what brand?Also could some one tell me what pitch prop I have ? On the back of the prop is the only numbers I found are PM317cup. I am thinking since its a 3 blade prop the 17 has to be the pitch is this right?