I use the extended aim line...basically kindof forget that the final object ball is even there...You reduce the shot to simply shooting the first object ball down a channel line.
Two key tips that seem to help (But seem hard to remember)
Avoid any type of english on the CB (I actually like just a hair of draw)
Don't hit the combo any harder than is needed.
Try to shoot the shot as smooth as possible.
For whatever reason...many people hit combos way harder than they would a normal shot...Just hitting too hard on regular shots is enough to cause a miss......(I hit combos way too hard all the time...tough habit to break)
and of course the degree of difficulty jumps way up as the number of angles adds up
straight - straight - straight = farily easy
straight - straight - angle = medium
angle - straight - straight= medium
straight - angle- straight = medium
angle - angle - straight = hard
angle - angle angle = super hard
Disclaimer - I suck at combos...
