I gave one...hot starts on a race car that needs a lot of advance to idle. But cannot start with that much initial.

Above statement is not correct. You still have vacuum and now you have it at the ported position and they both are about equal. Vacuum lowers though.

Now under WOT and load vacuum goes to near zero, but guess what, so does ported. It is exposed to manifold vacuum because throttle blades are open.

Ported is a switch. Normal stock cars designed on ported (Chrysler). There is no vacuum to the cannister until the throttle blades open enough to expose the carburetor port to manifold vacuum. Turn your idle up to about 2K and you will probably see ported vacuum turn on and start advancing timing. That is why you remove the hose when setting initial timing.