Read my plugs, was carbon fouling on 93 pump gas but not on 96 vp?

Those plugs being two years old makes it almost impossible to get a WOT read on. That being said, my opinion is you are 2-3 degrees short on timing for max power. And probably a full afr point rich at idle. The heat range looks close, maybe one step too cold. If that were my engine I’d dial in the idle afr as lean as it will idle happily, and see if it helps the sooty look of the top of the threads. If not, it would get one heat range hotter plug. Then I’d add 2 degrees of total timing, put a new set of plugs in and start looking at wot fuel.