Need a new prop for a '78 150 Johnson

[kf4pfw]

After a weekend best left forgotten except for fishing 3 days in a row, I am in need of a new prop...current prop is a 14 1/4 x 21 Aluminum on a 18 1/2 Foot 1978 Cajun Mk IV......

BEFORE this weekend, I could get 5100 at WOT and 53 GPS with two of us in the boat with a light load.....

Decarbed the engine when I got ready to bring her out (that's when I "dinged" the prop)...

Launched the next day......no vibration thank god but after blowing the crap out of her, the numbers are a little telling I think:

4900 at WOT and 50 GPS was the best I could do. Due to the strength of the accelration, I think the decarb did some good things.....

I am thinking perhaps dropping down to a 14 1/4 x 19???? Where's the best deal these days on a aluminum prop? Any suggestions as to size etc??

Thanks

[kf4pfw]

Found a 14.5 x 24 SS Prop here in the props4sale forum. My boat currently runs a 14.25 x 21 Alum, turns 5100 at 53 GPS. Would this be a good replacement? Been offered a good deal if it will work!