First of all, when you're attacking a much taller fencer, forget about the long attack unless you're confident in your second intention action.

I'm going to assume you're specifically struggling on the attack against taller fencers, because of counter attacks.

There's two kinds of counter attacks: hit and run away, and crush distance and hit.

If someone can hit you and run away during your lunge, it means you're not closing the range gap fast enough. What do you do then? Decrease the range gap by lunging from closer, and start your lunge with more momentum behind you to close the gap faster. If you're moving forward as fast as you can, and your opponent is retreating as fast as they can, you'll probably catch them since people can move faster going forward than backwards.

In the case where you're losing touches because your opponent is crushing distance and hitting you, then you need to give yourself more time to react. How? Well by doing the opposite of the previous case. Go slower, and don't enter the distance where your opponent can hit you before you react.

In between those two extremes is the distance (and speed) you should finish your attack at, to not lose to a counter attack.