Jaldon
While I think the community understands and largely agrees with your four goals, we do seem somewhat split over the means, which is why I was trying to frame the questions in those terms.
Personally, I really dislike the extreme variations that 3D3 and 4D3 can produce (especially if this single throw forms the basis of spawning for the turn), because it has too much impact on the Nid strategy - and I have a tendency to throw low numbers ÂÂ

 Consequently I would really prefer to fix the initial spawning values, 'boring' though that may be because it does not handicap the 'Nid player further. However, you seem somewhat averse to a fixed system of spawning points (also Hena it seems) because it does not "feel" right. Could you explain further what you "feel" should be right.
Equally, I am really in favour of applying modifying factors to this base spawning value, especially where they result from successfull tactics of the opponent - because this introduces the element of skill that we all prize so highly in E:A. There are two broad reasons to this:-
1) This move the point where the bulk of spawning occurs away from the opponents forces which is beneficial for many reasons
2) It reinforces the 'relentless' wall of the bugs that is at the core of the Tyranid racial makeup.