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I think you have the right idea. Adjust the intake cam to reduce volumetric efficiency in the low range. I would buy a piggyback to tune it because I think you have a cable throttle and you would not want to accidentally burn up something in your engine. Cable throttle means unfortunately you're going to only be able to run lean in the very low load range since you will need to dial the AFR back up to stoichiometric as the load goes up, but it should still help a bit. I think the Greddy e-manage blue or something like that should do the trick for just adjusting the fuel, and can be had for a little over 100 bucks used.
I would also look into having the head shaved down a little for raised compression if you have it out for cam replacement. The adjusted intake cam should allow it.
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