for boat wake yeah i think you're best off keeping the bow in. Just have the crew take a step forward to help it dig in.
Well in light air, fully under powered to almost powered (powered = able to plane, ish, in this case), you need to keep it high to keep the sails working and the boat moving at all. As the breeze builds you'll be able to drive off a little bit while maintaining the same speed. This holds true even if you're wiring, albeit you'll probably wiring off the mast. To ascribe numbers to this, say 3-6kts you'll do 4kts at 110TWA and 90AWA, in 6-8kts you'll be able to drive off to 120TWA, 95AWA, and maintain that 4kts of boat speed. In this mode the 29er is sailed exactly like an asym keelboat - right up to and including the kite being able to roll to windward sometimes.... In 9kts you might be able to plane if you stay high, but you might not make up that extra distance - and that's when all this shit gets "fun" (for me, at least, because i thought i was fast in it - because i usually pushed low).