1) Don't ONLY duck, duck and slip to each side a la Mike Tyson. Even if you're a pure boxer adopting that metronome style slipping is a good thing...it places you in position to counter with some weight behind your punch and it's hard to time. You can go left to right to left again but you can double slip to the left or right and throw them even more off balance.

When fighting a taller fighter it's always a good idea to try and screw up their balance and timing that creates holes in their defense that you can exploit.

2) Don't JUST lunge that is asking for it. This is a once in a while way to land a punch and open up their defense. You're in your boxing stance, guard up, act like you are Santa for a second and in your right hand you're holding the sack with all the toys in it....when you feint that right cross act like you're slinging that sack directly over your shoulder...you should have kind of a circular motion with your arm and shoulder and while you're doing that you shift your weight to your lead foot and from a crouch you leap in with the hook like Joe Frazier.

With that move you're looking for a delayed reaction the one I look for is putting their guard straight out like Rahman did vs Lennox Lewis in the rematch and it exposes the chin and that's where the hook goes.

When you're throwing that feint you'll have time to stop and reset and still be out of range...when you do it right you'll know and if you do have a good right cross it should work really well. Over emphasize the feint...make it look like you're loading up on the right cross. The point is you make them think you're lunging with the right cross....they may try to time it, they may try to counter punch but you shouldn't mind because in the crouch and loaded for the left hook you're in a fairly safe defensive position

I know this kind of thing doesn't work for everyone but you can give it a whirl and see if it works and if not, then that's cool too. I am just trying to help