Oh boy...not another prop ?

[BillTex]

87 V20, 2000 Johnson 150 Ocean Runner running Solas 15 x 15 alum. Engine was decarbed this spring. Plugs are new.

With just me, full fuel, usual boat/fishing gear (not 'lightly" loaded) I can only get 5k at wot.

Boat cruises 28 mph at 4k burning 8-9 gph.

Tach was verified with timing light. She jumps right up on plane quick. Cruises very nice at 4k with full load (4-5 People).

I'm a fisherman, not a racer, and I am happy with this performance...but shouldn't I be seeing more than 5k with this prop?
I don't want to be lugging engine.

Thoughts?

Tx, Bill