I don't know what you mean . . . ? How would we tweak it?
I like the shank on my pear, what do you call that kind of setting? Is that fishtail or prong or what? On the sideview it look like a sawtooth edge (somehow) holding the diamonds.
Have Luann use the same shank thickness in the CAD. When the CAD is done, we can now see whether the thickness looks proportionate to the effect you want. If not, then increase or decrease it as needed. This is for the plan shank design.
Are you going with diamond melees down the shank now? Do you want those diamonds to be the same size as your pear setting or do you want it to be more proportionate to the new halo setting?
Here's a photo of Dori's ring, the halo looks like it's bezel/bead set rather than prong set, anyone knows the proper term? It's a bit different from the usual halos.