Idle Issues...

I see what you mean. I clearly see misfires and double fires. Double fires are not actually double fires, but a firing in-between two regular firings. This is an induction cross-fire that usually originates in the plugwires having been run side-by-side, which is usually a no-no. Missfires can be for several reasons; 1) the voltage leaked away before it got to the plug, or 2) the plug shorted it away, or 3) it never got out of the cap in the first place.
I see in post #1, that a year ago the plugs and ignition were replaced. I'm assuming by ignition, you mean the plugwires? and maybe the cap? If not the cap then you need to inspect both the inside and the outside, for cracks, carbon tracks and moisture.
But; When I see this, I immediately flip my timing clamp, and if the problem persists, then I move the clamp to the #6 wire, and see if it's doing it too. If just one wire is doing it, separate it from other nearby ignition wires, to see if it quits. If it does , then the wire was probably picking up an induction crossfire. The wire may, or may not be bad.But if the problem remains, then it may be the sparkplug. Swap the plug to another hole and see if the problem follows it. If it does, it's junk.
But if the problem occurs with multiple wires, and cannot be traced to induction cross-fires, or a bad cap,then it may be the magnetic pick-up. I would rev it up slowly and watch the flashes and timing marks. If the timing marks are jumping all over the place and including backwards into a retard mode, then the polarity of the trigger may be reversed.But if the jumping never goes into retard, and remains about the same, then I would reset the reluctor gap, adding .003 to the gap, using a BRASS feeler gauge, or similar non-magnetic material. A good trigger will usually work from near zero gap to up to .020( and perhaps even more) without issue. But they have a sweetspot between .008 and about .015.If that doesn't do it, I would inspect the flyweight springs.
Now as to the timing marks;
Factory dampners have the long hashmarks at 10 degrees apart. Then there are 5 divisions between the long mark and the O mark, each representing 2 degrees. There is usually a 1 and a 0 straddling the 10 degree mark. I cannot recall ever seeing the number 5 on my dampner..Are you sure that you are seeing a 5?