Greetings to Moz Community.

Couple of months back, I have redirected my old blog to a new URL with 301 redirect because of spammy links pointed to my old blog.

I have transfer all the posts manually, changed the permalink structure and 301 redirected every individual URL. All the ranking were boosted within couple of weeks and regained the traffic.

After a month I have observed, the links pointed to old site are showing up in Webmaster Tools for the new domain. I was shocked (no previous experience) and again Disavowed all links.

Today, all the positions went down for new domain.

My questions are:

1. Did the Disavow tool worked this time with new domain? All the links pointed to old domain were devaluated? Is this the reason for ranking drop? Or

2. 301 Old domain with Unnatural links causes the issue?

3. Removing 301 will help to regain few keyword positions?

I'm taking this as a case study. Already removed the 301 redirect. Looking for solid discussion.Thanks.