I'll admit I don't know jack about I/O's... but are you sure that counterclockwise is the proper direction to set the vanes of the impeller? Also, if the impeller is good then it sounds like there's something blocking your water from cooling the engine. Since you say that you were running hotter than normal, and your water pisser isn't reacting like it normally does that would be my next thing to look at. (The route of the water, not the pisser itself) You either have a blockage, your impeller is backwards or your thermostat isn't opening. Gotta be one of the three. 
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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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