ditch the under-quilt (ridiculous bits of gear) and use a kip mat in the hammock instead. If very very cold, maybe stretch to taking some cut-down foil-coated bubble wrap insulation in addition (mountan marathoners use it as a stand-alone kip mat). As you are using a 3m tarp, pitch the hammock low and set the tarp closer down to it, dropping the windward edge - that way you will not be hit by moving air. Sorted.
think you will find that most people already do drop one side of the tarp and alter the configuration to suit the situation/weather,
Kit that may be carried by a mountain marathoners will more then likely not be carried by some of us, as it just does not suit our requirements, and visa-vi.