I found that somewhat similar running issues with mine were caused by a faulty plug lead. As you've recently changed the plugs maybe you opened up a crack in the outer sleeve or one hasn't seated properly. My bike idled and ran fine on little or no throttle but broke down under load. Interestingly it would come good at high revs if not on full throttle. Anyway, check your plug connections and leads.

My Girls Back! Thanks all. I see what you are saying about the mounting plate -- it will come out soon. Got the coil leads good and tight. Pulled all the plugs and I suspect that out of concern not to over torque them one may have not seated the crush washer. This has been bugging me for some time and it sure is nice to have her pulling smooth and strong. Thanks everyone!
 
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