Fantasy Trek Gaming: Photon Torpedo Rules

It just occurred to me that my simple photon rules don't really work. They shouldn't do more damage at close range, but in fact should be more likeky to hit at close range. Has to do with the fact that it is a torpedo, basically a powered bomb, rather than a phaser, which dissipates over distance. I should also add transporters to the list of internals. The problem is that having 6 works well for a 1d6. The alternative may be adding four more and using 2d6. Errrrr..... complications ......