The decision is made

GV's ratio works perfect for splitting gears and it's od ratio isn't overly dramatic and like hitting a wall when it engages.

However you only want od, and there idea was to use it as a od and splitter, why would you want to have a split like say 2.45 to 1.10 then 1.0 that would hurt performance and if you were using it to tow it would hurt badly, well you couldn't tow with the 200r but if the gv had the same as the 200 the performance isn't gonna be the same.

To cruise at 80 at the rpm you're looking for you'll need to keep that 2.9 gear with the 200r and it's .67
When you need to engage it and use it to continue accelerating is when you'll see the difference between .67 and .78 and why the .78 is better in performance