Great that you managed.
The setting of a "too low" filter is allowed, but a kind of a waste because you won't be utikizing the upsampled headroom for the Custom Filter. So, not advised but allowed (the other way around is not allowed because we can't filter beyond the Nyquist freqency (in this case after upsampling)).
I was clever ( I think :-)) and saved the new Mojo settings and loaded settings for the original driver. I noticed it sets everything except... the driver.
This depends a bit on the environment of the Save. Notice this goes by "sequence number" of the Drivers listed, and when you meanwhile eliminated a Driver, the sequence number of the one you originally used will have changed. So I think this will already happen when you go from Normal OS to Minimized OS. Well, not sure because it never bugged me and this can be coincidence (number can stay the same). Anyway I think this is explainable.
Btw do notice that I am not even sure whether you really mean Driver or possibly something else like Filter setting (it just reads like you may mean something else).
One final note. When loading original settings, so presetloader.xxsi, the XX screen shrinks to a small size.
Not intended but very well can be (a bug); dealing with the "scaling" is relatively difficult and the moment of saving happens under the hood in "normal" Scale Factor and the scaling is restored at start up. So I guess something like this last step is forgotton now.
Thanks for mentioning this.