Ah I missed that because you typed 'hir'. I thought that was a model of bulb. Yes, it has nothing to do with the '93 headligts other than the fact that they were designed for 'normal' halogen type bulbs. HIDs MUST be housed in proper projector housings or you will get that strange spread of light and cut off that you are talking about. It is also worth noting that the patterns you see on the ground are only the light that is being thrown downwards. There is going to be a fair amount of light that is going to be thrown up and to the sides as well, which is actually really distracting (and even dangerous) to the drivers of oncoming traffic.
You can retrofit projector housings into the '93 lights but it is time consuming and expensive. The cheapest way to get a decent spread pattern is to replace your HIDs in the headlights with stock halogen bulbs (a slightly higher wattage works well if you want more light). Then you can relocate your HIDs to something like the USDM/JDM projector foglights and wire them up as driving lights.
Paul