Red lion - sounds like you have it down. It is one of those things that once you do, it becomes pretty clear from then on.
As noted, lots of variety in what is popular now in vertical grips. The original broom handle grip was comfortable with a large plate carrier and long patrol type carrying. Overtime, the vertical grips have gotten smaller, both in height and mounting.
Suggest a little experimenting, so a longer Picatinny rail might allow you to adjust a bit more. You will find a happy medium.