I notice you are in central VA; I am just north of Richmond in Henrico Co. Have a 2012 ST with about 30K miles. (also an FJR)
Did you ever find a suitable scanner? Have you ever checked / adjusted your valves. I'm looking for someone who has done it to look over my shoulder. . . . I have a very well equipped workshop with a Handy Lift and machining and welding equipment.