AT Fire at night - no modifier?

[vulcan558]

I've just played a night scenario with AFVs and it has struck me that while direct and bombardment fire attract a -1 column modifier, there is no modifier for AT fire on night turns. In fact, in a scenario with 1 hex visibility, ALL AT fire will attract the +1 DRM for firing into an adjacent hex. This seems slightly counter-intuitive to me, as the whole point of the 1-hex visibility SSR is to reflect the fact that visibility is rubbish. Have I understood the rules correctly, or am I missing something here? Does anybody house-rule this situation?

Cheers

Rich