If the specs for your engine say 4500 WOT is ideal then yes, I'd think that a 14.5 x 17 was worth a try. Certainly don't want to over rev it, but you can always throttle back if you find that's happening.. then switch back to your old prop or try another one. Like Bradford said, it's more important to not lug the engine than to slightly over rev it.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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