Ok here goes.. Hope this helps..
Youtube Banner: Love it..sleek.. it tells who you are.. maybe consider upload times (like uploads weekdays) or something but that's solid.
Channel Trailer: You don't have one, this is a fatal flaw. When I come to your channel.. I want to know what your channel is about.. I don't know anything because there isn't a trailer. You'll see an uptick if you have one.. make it 30 to 60 seconds and tell 'what your channel is' and 'why they should subscribe' and then the call to action to subscribe.
Audio: The music drowns out or equalizes your voice, lower it a bit. It's detracting for me.
Thumbnails and Titles: Your thumbnails and titles should work in tandem, they don't really feel like they do. THey need to work together. So do an image that entices and asks why, along with a title that makes me interested.. Consider playing around with this.
TAGS TAGS TAGS - Your biggest failure by far is tags. You're not completely tagging. WHen you do a topic.. do a youtube search and google search and the use the drop downs that are applicable. You need a ton more (APPLICABLE) tags then you are using.
Hope this helps.