Drafting/Position questions

Couple of quick questions on drafting and position penalties after riding the course and rereading the rules.

1) Drafting.  The rules state: The term "drafting zone" shall refer to a rectangular area seven (7) meters long and two (2) meters wide surrounding each bicycle. The longer sides of the zone begin at the leading edge of the front wheel and run backward parallel to the bicycle; the front wheel divides the short side of the zone into two equal parts.  As I heard it explained once, keep 3 bike lengths between you and the bike in front of you unless passing.  There's a specific exclusion for 90 degree turns, but what happens in the case of a steep hill where bunching up can easily occur as those of different hill climbing abilities can close up?  You may have better hill climbing technique/strength than other riders, but because of the hill still cannot pass in 15 seconds - but still can pick of rider after rider on the way up.  There's no drafting benefit, do the marshals enforce a drafting penalty here?

2) Position.  So you can avoid a drafting penalty if you stay 1 meter to the inside of the cyclist ahead of you, right?  Thus it sounds like you could be one bike length back and 1.5m to the left or right at the same speed.  But then the position penalty becomes a possibility.  This one seems quite a bit less black and white: Except for reasons of safety and when no advantage is gained, all cyclists shall keep to the right of the prescribed course unless passing.  So in the real world, you cannot cross the center line (DQ) but you have a 5 meter wide lane in which you can ride.  Sounds like there's plenty of room to slowly close the gap on the rider on the far right by staying inside him, not violating the 1 meter space, and leaving room for another rider to pass you on the inside (avoiding a blocking penalty).  Or if you are riding behind someone who slows briefly and unexpectedly and you are about to enter the no-fly zone but have no intent to pass, can you just (safely) drift a little left momentarily until the guy in front of you regains momentum?  What really is the intent of and enforcement of the position penalty?

3) What other nuances are there to be aware of, and how much is based on the marshal's perceived intent (were you trying to draft) of your actions or do they really strive to keep it as a black and white interpretation?