I have managed to max skill my Gigas, Berserk (after 20 something blue porings), and Chu chu (because Gungho knows I do not have a green team)
I have gotten 3 skill ups on masterling (a use for all those Woodsies), 3 skill ups on CoC Healer (figure I would be more likely to use her for orb changing before Angelion), 0 skill ups on Vamp Lord Duke (he only needs one more for max skill), and 2 skill ups on Valk.
Other than tuesday when I went through rainbow keeper twice (need rainbow keepers for Berserk's ulti evo) and Pengdra village yesterday, I have been running expert Poring tower non-stop.
I will continue until I get that Valk Maxed... Since I am not descending, it gives me something worthwhile to do. and 9x Healer team, with King Shinee makes Masterling go down quick.