I rotated the recirc hose completely probably 35 degrees couner clockwise. No kinking here
done some research and talked to the master tech at subaru which i work with and he said the backfiring *i had it too* is due to poor recirculation, as i wrote before mine didnt kink but made a oval passage like you stated, though it doesnt seem to affect it at first these back fires are do to not enough air recirculating back into the intake manifold.
thus i was told to wait to get an intake before even bothering to reinstall, i would suggest you do the same.