In general, I haven’t run into problems with the ILS being off the centerline, other than some specific airports where it’s been identified by several folks as misaligned. But in general, the vast majority of flights in those aircraft line up correctly at most airports.
If you can give me some specific airports you have the issue at, I’d like to cross check them and see if it’s the ILS being misaligned, or the aircraft having an issue with specific airports.
If you want to check an airport that I know is working correctly, you can try runway 30L at KSTL. I’ve run that approach many times in both those aircraft you mention, and both work fine there.
Are you running any aircraft or scenery mods at the airports you have problems with?
Regards