Well, you can pay $180 for an aftermarket standard clutch, or $50 for a server duty that draws a bit more HP.
Or $50 for an aftermarket standard duty clutch and drill out the fan holes to 10mm.
One size doesn't fit all.

 

The severe duty seems to work well although I don't hear it as much as I thought I would

 

Next mod is going to be either the soft spring 180 thermostat or the inline thermo mod

 

go with the soft spring $36 on ebay MOTORAD 439-180 Thermostat | eBay