Best emitter Vf for HDS mod

[Lolaralph]

I'm molding my HDS with a K2, I have three emitters to choose from, an E,F, and N Vf bin. These vary from 2.3-2.8 for the E and F bins to 4.2 to 4.4 for the N bin. Should I worry about Vf when I choose which emitter for this swap, and if I have to worry what effect will it have on the final product

Thanks