Awesome to see your deep sky work again! You have nailed the details in the OIII - one strange supernova remanent. Some wicked magnetic fields going on there. But, it seems to be charging through space, as your Ha data reveals. Some additional Ha data would further detail that bow wave - the mass is moving! And hydrogen is getting a bit gee'd up there. Awesome OIII details - probably the best ever. Love it!