The question is, what is lugging? The only approach I can utilize here is that she'll complain when she doesn't like it. This is why I usually avoid using her at those <2.5k range (except for low gears) and am gentle with the throttle at low revs. Over 3-3.5k I can gratify my passion and do aggressive pulses
I know people at f650.com who say never to use this engine under 4k - this is what I call extreme babying by not babying and I think it's highly superstitious
and it seems she can cope with my typical 2.5-3.5k range on the long term too.