The main benefit of a Philips entry is that it increases the speed range of the airfoil, by reducing drag at higher speeds. It also reduces the camber by a little as well. But, the main 'benefit' is a higher speed or better penetration than compared to an airfoil without Phillips entry. It probably affects the stall characteristics as well, but I can't speak to that. I don't design them, I just build and fly them.
The Skip Miller modification to the original Aquila airfoil was accomplished by gluing a 1/16" sheet of balsa to the bottom of the wing from the leading edge to the rear of the spar and sanding a slight Phillips entry into the front edge of the sheet at the leading edge. This improved the speed range of the airfoil even though it also made it thicker. Another side benefit of this modification that is not discussed anywhere that I can find is that it increased the wing strength by completing the "D" tube.
This is all incorporated in the Aquila Grande. It would be easy and a good idea to incorporate some wing strengthening updates to the spar, but the airfoil modification is already incorporated.