+1. With OC CPU/GPU kernel, the stock ROM will run smoother. I remember how the last year we all pray for that. We signing petitions for chance to OC. Now we have it for custom ROM and it's cool! So if it's possible will be very nice, because I think there are many Ace 2 users that like to use not only custom, but also the stock ROM.
Samsung > GALAXY Ace 2 < GT-I8160
Android > KitKat 4.4.4 < Cyanogenmod 11