I know what I'm seeing in your pics, they're quite clear. You have indeed dug quite a crater in the centre, and there's something ugly at about 80% radius as well. Then the edge literally falls off a cliff in the outer couple of mm. Plus the dog-biscuit problem which is also evident.
You could ignore the TDE and instead mask off the outermost 2-3mm of the mirror, but given the central crater and the other issues IMHO you're better off taking it back to a good sphere, and starting over and this time learn to do it without making a crater, or the TDE, and without the lumpy dog-biscuit surface. In doing so I'd also re-do the pitch lap as I described above, it will take an hour or two, compared to the time wasted to fix a lumpy surface.
To avoid creating a TDE I always removed some of the pitch around the edge to make the tool about 2cm smaller in diameter than the mirror being polished, or shaped it like flower petals so there was less surface contact near the edge.
At a guess you worked MOT to produce the crater. Working TOT may correct it but what you have right now is so bad it may be quicker to find grind it out, back to spherical and repolish with a LOT MORE TESTING to see what's going on and avert a catastrophe before you go too far. An alternative way of looking at this is that you're making changes far too aggresively between testing, and to solve that you could slow down the figuring by using rouge instead of cerium oxide.
While I appreciate your enthusiasm, what you are attempting is not trivial and even very experienced mirror-makers think very carefully before attempting one under f/4. You aren't one of them, yet, and there is no easy shortcut.
Edited by luxo II, 01 October 2020 - 06:26 AM.