Davegcc wrote--"Would not the over axle variety eliminate this issue? Most seem in favor of under axle set up to eliminate clunking and vibrating; my situation seems to suggest the opposite?"
There's nothing wrong with using the over the axle setup. There are more spots it has to clear so it does take some careful positioning. I use a thin layer of the red high temp silicone on exhaust joints which makes it easier to re-position the pipes if necessary.
I seem to recall a time when all the 240 series cars I saw had the over the axle pipes--and then the under the axle pipe is what became available. - Dave