I was at Yankee Stadium for the Twins series in early September and watched Pagan vs. Judge during the Monday game from about 30 ft directly behind home plate. Pagan blew him away, with the last pitch nasty just off the outside corner that induced a swinging strike, and his new breaker looked filthy. I'm optimistic he can be a valuable bullpen piece after this change, as most of his homers last season seemed to come off his cutter, just based on what I remember watching. I also like his demeanor as a reliever, as he seems relatively undaunted by failure, which maybe explains his stubbornness in going away from the cutter, but is a good trait to have in general.
