1, Not likely
2, Not unless the jetting problem is between 1/4 and 3/4 throttle. Check the
carb tuning article to see how the different circuits work.
3, There's lots of points of view on this. If I understand things correctly, the main reason to run more oil is for the extra power you
may get if your jetting is spot on, and unless you use race gas, don't bother trying. I don't know what tts is, but with any reputable brand of synthetic, 50:1 is fine, unless you ride wfo with a heavy load for hours on end. I personally use 66:1 with mobil mx2t.
Also, keep in mind more oil means less fuel, effectively leaning your jetting.
4, yeah, can't hurt :).
Another thing to think about is the fuel you run. Not sure how things are in Qld, but here in vic, there is some difference between pump fuels. Eg, 2 regular pump fuels (same octane, supposedly) from different suppliers require quite different jetting. As far as I know, regular fuel was relatively similar, at least to jet for, until recently. When I had my kdx, the jetting recommendations here were spot on. I don't think they would be now. Just something else to think about :).