Seems good to me.
For "Morphology" I have English and French.
For the encoding, it's similar to your screenshots, bit with event less checked options.
All inheritance settings are checked.

I really wonder why accented letters are causing problems in your case.

My own Stats

Archivarius:
Files : 494 870
Words : 11 395 416
Size of files : 192.54 GB
Size of text : 21.79 GB
Size of index : 8.55 GB

DT Search:
Files : 68 226
Words:  8 554 465
Data size (size of text) : 3.8 GB
Size of Index: 2.6 GB

Both have big indexes, but Archivarius doesn't seem outrageously huge here. It's actually smaller than DTSearch, proportionally speaking. I can't compare with X1 as it's long gone because of severe problems described earlier. I can't use a "desktop search " software that imposes strange limits on the document length it will index. I don't know if those limits still exist, but they've been there for quite a while.

[Edit : you'll notice that here the Archivarius index is about 22.5 times smaller than the file size, but only 2.55 times smaller than the actual text size. If the numbers you gave are only an estimate, the estimate might be off the mark, unless the text size is about the same as the file size (4110 GB) you gave.]