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There should be an adjustment screw to turn the engagement temperature up or down on the fan clutch.
Try that first, get the fan clutch to where the thermostat can open most if not all the way then have the fan come on once passive air flow isn't enough to cool it down.
We had a guy that would take stock duramax fan clutches, turn the engagement adjustment screw down 5 or 10 degrees, resell them for $100 more as up "grade fan clutches" for 6.2L and 6.5L diesel engines.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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