No way. Not at all. Not only that, but it would definitely get you less clicks even if you did get better rankings.

Always remember: Your page's title is the thing your potential customer/user/client will be clicking on to first visit your page. This is a very important point of first contact in the digital marketing world. Think about the way you search and what gets you to click on links from Google. I bet it's somewhere around 95% based on the title present.

If you were Googling "Xbox One Games" and saw:

• Xbox+One+Games+Review+PS4+Games
• Xbox One Games Reviewed and Uncovered

Which one would you click?

links that don't exist or links to pages that don't exist?

..heck, either way i'd ignore them and focus on phase 2 of your plan. Disavow seems to be a bit overused in my opinion. It's more of a last-ditch effort for penalty recovery IMHO.

and if it's 404 errors you're trying to fix: Google will eventually stop following those after they 404 long enough. Don't even worry about it. (unless they're links you want, then put a relevant redirect in place.)

Hope this was helpful.

I'm responding to this in a semi-rushed matter as something is coming up but I just want to mention that the most likely reason for Google to index this version of your URL is because of the links pointing to it. Those which caused you to put a 301 in place, those that were 404ing prior... They are clearly demonstrating to be the authoritative URL to Google.

I'm not sure why you're worried about what the customer/user sees for URL. They are most likely looking more at the Title/Description in the SERPs well before the URL string. Most people only read the domain portion of a URL string and it's more used for the search engines purposes.. (my opinion) Also, once the user clicks your title or page they are taken to the redirect and the full URL string will be visible in the address bar of their browser.

As for why your rankings are affected... I'd be surprised if it had anything to do with this, honestly. If anything redirecting should help especially if you had links pointing to a broken page. The only exception would be if those links were poison, of course.

Okay got to run hope I was helpful. Good luck!