The diff hanger is really important. In fact, that has always been what does most of the supporting.
I tend to use a bit of the old rubber.canvas exhaust hanger, bolted to the diff front plate (penny washer) then a U clamp around the exhaust, and a simple L bracket made in a vice bolted to the other end of the strap and tucked into the u clamp.
Bit of faff getting the strap the correct length, and drilling the hole. That stuff does not like being drilled!
On my spitfire I have a solid mount to the gearbox, and then a diff hanger and one at the very back. Very solid with no movement but no noises from clanging either. Just as well, I have 1/4"clearance either side of the silencer between the chassis rails.