I can see a reason for increasing of gravity wells, but I'm not sure about the disproportionate difference in sizes.
The maximum distance that structures can be placed does not appear to have changed, this has two consequences
1) area near to a planet can still be crowded, making it awkward for capital & titan class ships to navigate around
2) allows a lot room for carrier & anti-structure cruisers to sit well beyond the range of defence turrets & starbases.
The large difference in the size of a grav well and the distance a ship can phase jump can also slow down fleet movements, especially when a ship's course is a chord.
If all these different sizes were increased by the same amount then this would, IMO, be a better solution.
