I would suggest sending a bug report to artrage team directly in your case.

there's a fair amount of issues people were running into with sonoma, both wacom and art app related, and they all pretty much require the code to be updated; there're no under the hood magic settings in artrage that can make a lot of difference.

I'm not sure what would the developer do in this case considering it's a combination of fairly old release and a new OS causing the problem.