you mention the tires shaking real bad at high speed, all of our dyno tires are balanced. you get big time tire shake if theyre not. we also run 12psi in hoosier slicks and american racers.
the bike getting hotter then usual, is there a high powered fan in the dyno room to point at ur radiator?
whats the gearing? you talked about load, we simulate load with gearing. usually the biggest c/s and smallest rear sproket you have, or shoot for 90-100mph.
and finally without the answers to those questions, i think your just lean. adding timing produces a hp drop, its getting hot, and the decline in hp on the third pull of three. one easy way i can tell if a bikes lean is the incriments the bike makes hp or loses hp in a group of 3-4 pulls. if the bike let say made 93 first pull, 92 the second, and like 85 on the third i would say that its lean. because on the thrid run the bike is now hot, too hot. now on the other hand a bike that gets on a makes 85 first pull, 90 the second and 92 the third. i would say its rich, the bike was getting up to temp on the first pulls and making good power on the last pull.
now of course there are a list of other things i look at to determine lean or rich but generally if the bikes gains hp every pulls its rich, if it loses hp after each pull its lean. when you can stack dyno graphs on top of e/o you know your close on jetting. hope some of this helps