Only really watched highlights of Arsenal under Arteta so take these suggestions with a grain of salt!
Regarding your central mid pairing, does Ceballos get forward consistently or sit more deep and help recycle possession? If the latter I would lean towards DLP D for Xhaka and DLP S for Ceballos, perhaps with 'take more risks'.
If the F9 role doesnt work, I would also possibly consider a DLF A for Lacazette as this will still get involved in the buildup and offer a threat in the box.
In possession I would probably try just one of 'shorter passing' or 'play out of defense' initial