I make a dedicated resting block for mine so I don't have to lay it on it's side & torque the bar/base plate. It stays pretty square this way. If it's a show cut , I too score the line but cut a bit shy of it & pare to it. I do the rafter square thing too, but have been burned by having the clamp vibrate loose. I don't trust it. Keep your chain sharp & oiled, use a rip chain if you're doing a lot of cheek cuts with the grain & watch out for the part of the bar hanging out of the work making contact with your leg. I've used mine mostly for tenons on logs.
