Yes, I am an idiot. I wrote it backwards, I apologize and can only say that I get confused easily...
Edited pics for wording...
I have some pics that might help explain.
Looking at the ground strap from the side:
Looking at the plug from the thread end:
Turn the plug so that the ground strap is at 12 o'clock. The black, sooty area should then be between 9 & 3 o'clock.
Read <HERE>. Good info...
I run a 421 cub on alky with 39 Kiehins with a single PJ on each, EGN needles on the 2nd clip, 60 pilots, 118 mains, power jets open to 4 turns. Timing at +8.
Typically, I start with PJs open 4 turns. Watching plugs and exhaust temps, as the day cools, I will close PJs another round or so, a little at a time. Also, the right side usually wants about a 1/2 turn more fuel than the left side.
It is difficult to tell for sure looking at pics, but I still think you are a little lean (the left plug looks leaner than the right) on the stock cylinder bike and have a tad too much timing.
I can not tell for sure about the cub plug.
As stated before, don't be afraid to tune each cylinder separately.
I hope this helps...
Rick
Simply, more alky will wash and cool everything down.