Something I've been doing semi-frequently and I think (not 100% sure) it's a factor of spacing it horizontally towards it's max range.
I hit people with the first and last hits of default up-b (as in, mostly avoiding hitting 2-4?). I have not seen someone escape this thus far; either by attack, air dodge or 'falling out'. I feel as if this has (very rarely) given me combos on the odd vertical disparities as well.
Other things like inputting away from your opponent and then back towards them could also help.
I felt this was the best place to bring this up, but maybe this has been covered somewhere else?