The Cerakote looks decent. NP3+ in a "Norton Special" may help too.
Predator Custom & Bowie Tactical(David Bowie of Ohio) are known for Glock services.
I duracoated my Glock 19 Gen 4 a few months ago and it made hardly any change on the feel of the Grip. If you feel like you dont like the feeling, Then go right ahead and buy a $12 Pachmayr Grip and slap it on.. The pachmayr grip is has a wonderful feeling. Go right ahead and Duracoat it. Duracoat gives your glock personality.