I am actually considering a little bit of top end on mine aswell because of similar reasons.
approx. 2 out of 10 cold starts she blows smoke (not blue just solid white with a feint odour)
In talking to other mechanically minded people i think my problem, is a worn valve guide, so that when oil is up top there it can run down the valve shaft and there is a couple of ml of oil sitting on the valve waiting for me to fire it up so that this oil can enter the chamber to burn with the fuel/air. This also indicates its likely to be happening only when i stop the engine on tdc (when all the valves are shut) otherwise the oil would prob just run down over the rings.
as for noises i am playing ignorant, they clear up after a minute for me, so i just think the oil is taking a bit to get up the top.
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Yamaha XT600 1988
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