Reducing the flow? Wrong way.....do everything you can to INCREASE the flow....
If you have an internal trans cooler, consider bypassing it and running only an external cooler...helps keep heat out of the cooling system.
Also, make sure the primaries on your carb aren't too lean....check your plugs, measure with an A/F meter or else just step it up a few jet sizes as a test.
Of course, you've already ensured your timing curve is optimal......
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"XE cam basher" 
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