You can remove recommended videos by selecting "Not interested" on your homepage, this will influence how YouTube suggests channels to you in the future. Here's more about managing your recommendations: https://goo.gl/mfD7rf . Hope this helps.
Thanks for the info. Have you tried clearing your watch & search history as this also influences your recommendations. Here's how you can clear the search history: https://goo.gl/Sq43HM and here's your help for watch history: https://goo.gl/Kvmuis . Hope this works.