I really think the best way is to use the playlist option for the differents shows, I'm gonna try to explain why.
For exemple if you have 10 shows and 10 channel with each 200 subscribers, it's less seller than if you have one channel with 2000 subscribers. I think that playing in the mind of each.
In your case when some one think about you and about one of your show he must think tech zen tv. If you dispersed your audience with different key words it will be not clear to find your web site after.
For finish I give you an easy way to have more subscribers on your channel, just ask to your audience to click and subscribe very simple and since I do that It work well.

That my opinion :-)