Prof, can you enlighten me in the model used
The Prof has used both the Lockhart-Matinelli and Dukler correlations for two-phase flow, but he favors the Dukler correlation. Both correlations are rather involved, though the ASHRAE Fundamentals Handbook does a nice job presenting both in its Two-Phase Flow chapter.

Wouldn't the 70psi pressure drop give a better distribution of the refrigerant mass flow?
Marginally, perhaps, over that of a 10 psi pressure drop

It would limit pulldown speed, but it would also limit heat dumped into the condenser during pulldown.
This is really the problem you have with very high distributor pressure drop... you limit pulldown capacity, and effectively limit the range the TEV can operate. But with an oversized TEV, this will be less of a problem.