I'm sorry that I-Doser hasn't worked for you yet.
They worked for me the first time, and every time since..so I'm not sure what to say. What helps for me is to be laying down in either the dark (with something over my eyes) or during the day (ditto). I've never gotten any hallucinations with my eyes open, but I've had audible ones, as well as closed eye visuals that weren't just colors. Also, I've had, ermm..feelings (for lack of a better word) happen to my body.
I'd like to mention that I've got some experience with meditation, which is all about clearing your mind and not focusing on anything while being in one spot for an extended amount of time. Sort of like a trance, you might say. Anyway, it might be beneficial to you if you read up on meditation and used some of those techniques before using a Dose?
Some people say to focus on the sounds in the Dose, while others say don't focus on anything at all. I've found that it helps when I focus on my breathing at first to keep my mind at one focal point, which calms my brain down.
It sounds funny, but it's hard to not think about anything at all, and by 'calming it down', I start focusing on less stuff (the Dose, my bed, what's been going on that day) and eventually I don't think about anything at all. THIS is when the Dose is best for me.
I think that this is something that takes a lot of practice. Just like with any skill, for some people it comes easily, and others have to spend some time (or even extended amounts of time) to actually master it. I don't think I've ever experienced a Dose's full potential (yet!), and there are times when my techniques don't work as well as I'd like them to, but I believe that if I keep working on these things, I'll get better and my experiences will get better.
Also, I'd like to mention that I've just learned about I-Doser and have started using it in only the past two days or so. I'm not very experienced with it, but I can say from my own experiences with the Doses I've tried so far (Crack and Peyote) that I-Doser does