Steve.... This is one of those situations where you search for the best compromise.
If you consider there are areas of location which are critical to a good fit, then you have to choose which is best for you and involves the least damage to your new chrome finishes.
The mounting hole in the small bracket at the rear of the silencer may be just slightly in the wrong place, as may be the bracket itself, making the silencer too high. The mounting bolt though the lower lug that clamps the plunger column should be fitted with the thick built in "washer" to the outside, positioning the silencer away from the frame tube. Extra packing here is possible.
We all like to think the exhausts will fit perfectly from a well known supplier, but experience shows this is often not the case. I would make sure the head ports are clear of carbon and rust, maybe work the surface with a bit of emery or dremel grinder,
grease the pipe end and push and wiggle the pipe so that it bottoms in the head. Push the long stud through the joining tubes in the frame out of the way and position the exhaust pipe and silencer so they clear the frame and do not obstruct the brake pedal.
This means that any fine adjustment can be done on the exhaust pipe mounting bracket. Tweaking the bracket and enlarging the hole are less noticeable here. If you are lucky and the hole lines up with the stud, a few washers here can move the pipe sideways for the best fit.
Fitted correctly the silencer lies extremely close to the frame tube without actually touching.
Swarfy.