I noticed at the bottom of the v1.4 patch notes, they mentioned that they are looking at ways to manage to time investment of creep surge, and I believe I have come up with a very elegant solution.
Instead of having to clear 4 regions per wave for 15 waves, why not simply have it set to clear 60 regions total, with each region individually resetting as soon as it is cleared, up to a maximum of 15 resets per region? This would essentially be exactly the same as the current system, except that it would completely eliminate the problem of having to wait around for someone to reset the whole wave, just so that you can have access to the region appropriate to your level. No matter what time of day you or your guild mates log in, you will always have a good surge target available.