I have the high profile 5.5" banana cut chopper, but I am wanting to try to shorten the feathers (and therefore the profile) to 4". My plan is to shim them with a popcicle stick trimmed to the necessary size and glued in place along the top of the factory placed guide. Something similar might work for you, too. Although you may want to play around with the angle and/or taper of your shim, until you find something that works for you.
The thing that I like about my idea, is that you can play around with it as much as you feel like, but you're not making any modifications to the chopper itself, so if you end up finding something else that works better for you, you can still sell your chopper to someone, and it's still like it was when it left the factory.
Just an idea, hope it helps. Good luck.