Post migration issues - #11 + configuration issue

[SMVSEO]

Hello Moz community.

I'm keen to find out your experiences on the following:

1. Have you ever experienced a migration whereby a large % of keywords are stuck in position #11 - post migration? The keywords do not move up or down (whilst competitors jump from 13 to 9 and vice versa) over a three month period.

Please see the % difference in the attached e-mail. (sample 1,000 keyword terms)

Question: Has anyone ever experienced this type of phenomenon before? If so - what was the root cause of this and did this happen post migration? What solution did you use to rectify this?

2. Have you ever seen a cross-indexing issue between two domains (each domain serves a different purpose) post migration, which impacts the performance of the main brand domain? I will explain a little further - say you have www.example.com (brand site) and www.example-help.com (customer service site) and the day the brand website is migrated (same domain - just different file structure), www.example-help.com points to the same server that www.example.com is on (with a different file structure) and starts to inherit the legacy file structure. For example, the following is implemented on migration day:

I will explain a little further - say you have www.example.com (brand site) and www.example-help.com (customer service site) and the day the brand website is migrated (same domain - just different file structure), www.example-help.com points to the same server that www.example.com is on (with a different file structure) and starts to inherit the legacy file structure. For example, the following is implemented on migration day:

For example, the following is implemented on migration day:

www.example.com/fr/widgets-purple => 301s to www.example.com/fr/widgets/purple

But www.example-help.com now points to the same server where the customer service content is now hosted. So although the following is rendered:

So although the following is rendered correctly:

www.example-help.com/how-can-we-help

We also have the following indexed in Google.fr - competing for the same keyword terms and the main brand website has dropped in rankings:

www.example-help.com/fr/widgets-purple [legacy content from main brand website]

Even when legacy content is 301 redirected from www.example-help.com to www.example.com, the authority isn't passed across and we now have www.example.com (as per Q1) a lot lower in Google than pre-migration.

Question: Have you ever experienced a cross-indexing issue like above whereby Google potentially isn't passing authority across from legacy to the new setup?

I'm very keen to hear your experiences on these two subjects and whether you have had similar problems on  some of your domains.

E0hbb