The 3 most important things to connect to basket every time are:
1.don't look at hud simbology
2. concentrate on tanker, not on basket, but on one spot on the wing of the tanker as a reference point
3.throttle has to be moved constantly - push it forward in small adjustment for second or two, then when you see that you are gaining on tanker, move it back alittle, when you see that you are lagging behind, push it again.. After time you'll learn to time it before actually gaining/legging behind tanker.