Timing tips

Also, I made up my own blend of the EFI Source table mixed with the factory table and ended up with this:

View attachment 1715861867

It's already a world of difference on a full throttle hit or any quick throttle jab. Pulls much harder right off the hit and carries it better through the full rpm range. I think it probably still has more to give if I wanted to bump it a few more degrees, but I'm trying to keep it safe for now. Highway cruise is also better, though maybe still just a few degrees shy of where it wants to be. I can cruise in 6th at 65 now pretty cleanly and maybe 70 on flat ground without much shake. It's running closer to 70% load and right around 20 degrees in that scenario, which is up maybe 3-4 degrees from where it was earlier. Thinking about throwing another 2-3 degrees at it and trying again to see if that cleans up the last of the shake. Overall it feels much more like what I would have expected out of the engine. I know it's not a fire-breathing monster, but power to weight it's similar to a C5 Vette and should have some get up and go to it. Now it at least feels like it's trying.
What do the numbers represent in the left vertical column?