Well, for blissful experiences, I think the first thing that has to go is the idea that concentration is the key. It's not. In fact, making yourself concentrate is anathema to bliss.
Try a permissive approach, that's where the bliss is. The whole "everything I do is ok" mental judo that stuff like Transcendental Meditation does sends you pretty reliably into blissful feelings.
It's a positive double bind. It's a "if you do it wrong you are doing it right" kind of thing.
Just get yourself a nice mantra, let your awareness rest on it, and allow whatever happens to be part of the mediational process. Does your mind wander? Ok. Just accept that and bring your awareness gently back to the mantra. Include mind wandering as a desired part of the process. That way you can feel that you really can just let go and enjoy.
