You're over analyzing and worrying too much. So what if the gauge reads a little high. You have good compression, all holes well within 10% of each other.
Screw the plugs back in and consider the compression good. A rough idle unless it is a dead cylinder type rough idle is most always caused by something besides low compression. As a matter of fact if the compression were low on all cylinders equally, you would probably have a smoother idle.
So, consider the compression good, eliminate that from your list and move on to the rest of your troubleshooting. What plugs and gap are you using? Platinum plugs have a very thin center electrode that will sometimes offer a slightly rough idle on these engines. Also you can't gap them too wide, or you will get a slightly rough idle.