I think it's the right decision fella.
Like has been said above ... I would do a full string over the chrono and find where your best 40 shots are. If they are doing under 20fps spread then shoot some groups rested off a bag ( prone ). If you are getting under 20mm groups at 45 yards then I'm not sure I would worry about a regulator. I'm presuming you have found a decent pellet/Die for that rifle?