It sounds to me as if you have a serious mis match of fuel to air ratio under those load conditions.
if you remove the rose colored CCP, and pull out your 80 37 jumper, it should operate in its richest ( fuel) possible mode I think.
if that alone does not fix it, try that in addition to the stock air filter.
and if these moderate steps toward adding more fuel than air to your mixture under load do not help, well, then you know you have some other issue..
cat removal, aftermarket exhaust, and different than stock air filter could certainly surpass what the machine is capable of mixing a good fuel.ratio for in my opinion.
maybe you need a power commander, or some other device to add more fuel.
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