My site used to be on a subdomain like: ecom.domain.com. Than I tought it wuld be better using on domain.com, so I redirected 301 everything, and used the change of address tool. Now I think that old site (which has used some shady backlink technique to rank) is keeping me from ranking better in serp. If I delete the 301, will google notice that I dont own those old backlinks and they are not redirected anymore? Or I should use disavow tool too?