ZVH engine so CVH (n/a) Magnex manifold and Zetec silvertop sump.

Clearly twatted the road a few too many times and so the manifold is now sitting against the corner of the sump and is making a horrible resonance at certain RPM (not to mention probably sending a fuck load of heat into my oil).

I can lever it away from the sump with a pry bar and wedged some exhaust wrap in there but the tiny vibrations just wear through this in no time. Went out and bought a 5tonne ratchet/tie-down strap and used this Friday morning (after a run so the system was nice and hot) to pull the manifold away from the sump. This created a good ~1cm gap all round and have left it like that for the last 2 days hoping the manifold might at least take "some" of the form it was being held in.
Released the strap just now and of course its just pinged back where it started

Anyone got any thoughts as to what the hell else i can try?

Cars a daily so whipping the sump off and getting the corner cut/tigged is not an option (plus reducing sump capacity etc isnt where i want to go for what is essentially an "annoying vibration") and the Manifold is fine other than this so again don't want to be buying new either.