You could try filing out/slotting the holes in the manifold about 3mm-4mm where it bolts to the head with a small round file.
i have done it on my old Lifan 150 manifold
another thing you could try is a thinner insulator/spacer under the manifold too, i have one that is 6mm thick
the one on your's looks about 8mm-10mm thick.
It is hitting the frame atm isn't it?
looks like you need a manifold with a different offset, however this may mean the air filter will rub your leg up.