I got 3 points leves getting speed bonus a few times... Once you have the right rank and STR the chance of sweet spots being always at same spot is very high.

Yesterday i got it in treespeak...took me 17 chops to complete the leve. 13 of the 15 sweet spots were a bit under arc center and the other 2, due remainder, were obviously mahogany log so i went straight to very top of arc to get it.

But the thing is...i don't think there are other way of getting bonus unless you're in the very situation i am (r44 so i'm about to "change camp"...so this might work for 33~34, 23~24 and 13~14 as well). I just leave the notch at default position for crapier drops and keep trying to chop where i often see the most common sweet spots. So yep, you do might need to be very close to camp limit to be able to one-chop most of points.

In halatali the sweet spot is often very high at chop arc, like a pointer from top. In treespeak, Iron Lake and Cedarwood its often a bit under arc's center. In Nophica and Bloodshore, if not mistaken, it's often in the very center or a bit above center (there's some time since i last logged in Nophica and bloodshore).