Try high level u, maps with the most features
Your biggest problem will be do you have enough room to store such a map

Incidentally, the Compatible Chart is the perfect tool to see which chart you should or can use.
Unfortunately you will come across other terms in TTactivator.
But you also get used to it again and if you have forgotten it again, but you know via the information from the Compatible Chart which you can always start somewhere with TTactivator, the last screen before you start the actual download shows the version number as in the Compatible Chart and you can cancel the option and choose another one.

Incidentally, removing the mapsettings.cfg was that the solution?
In 9 out of 10 cases this is caused by not always being compatible with the new map