I'm in the same boat as you; would be interested in your results, such as they may be.

One hypothesis I entertained for a while was that training at the game of Go would improve my visualization, since one of the basic skills ("reading") appears to involve actually hallucinating stones that aren't really on the board.

In practice, I found that I was able to reason about what stones would appear where, while still dismally failing to see them in any meaningful sense of the word. If anything, the primary modality was kinesthetic - I was representing internally the feeling of "clicking here then there".