Have been trying out the PAA injector for the past couple of weeks and not particularly happy with it. The blade stops seem roughly formed with the result that the blade seems to move up over time; I have to look and make sure that the blade is aligned properly before each shave. One time it even slipped enough so that it was sitting on top of the stop and extending farther out over the guard than it should.
I am going to try filing the stops to reshape them and provide more of a secure hold on the blade and see if that solves things. I can see the allure of the injector shave, the blade is stiff and durable and very effective. But I don't think it is a better shave for me than I get with my Focus Dynamic R48. Probably going back to the Focus.