I've been having trouble getting through levels 7-10. The general tips I've read are that you should serve noodles by more or less splitting the map. For example:
if there are 3 people on one side of the map, serve the 3 noodle packs, toss the rest. then before crossing to the st. marks side of the map, pick up another 6 noodles to serve to the remaining 4 npcs.
is that what I'm supposed to be getting at? makes sense to me, but I have yet to try it (taking a break from the game right now).