Aerobic running, hills, V-dot score, oh my!!!

Well, not really.  The goal is correct, but you don't need to stay 100% in Z2 in order to do that.  If your HR spikes a little bit on the hills, just roll with it as long as you don't have to waste all your energy to get up it (and don't try to maintain the same pace up the hill either).  Hills are good.  Embrace them.

OP, it is impossible to say exactly since we don't know how valid your test and results are.  I would choose HR or pace and stick with that to start.  Let the other fall where it may (feel free to note the data, as eventually you should be able to use either).  Then, as you run, take an assessment about how you feel.  Are you comfortable?  Can you hold a conversation?  Can you maintain the pace/effort for the duration of your run?  Answering those questions should let you know if the effort/HR/pace are working for you or not.  The main goal is run at a level that creates some stress but, on most days, leaves you feeling like you could do more at the same effort/pace.  And leaves you able to come back and do tomorrow's workout (and the next day, etc.).

I think this is really the key and for a lot of people (including myself) is more difficult than one would think.  It has been my observation (right or wrong) that many if not most people pace their easy runs too fast.  The cumulative effect of running too hard too often can lead to injury and builtup fatigue that prevents or delays you from attaining your long term goals.  I have been so guilty of racing the clock or being too fixated on it.  What really helped me was a challenge where we had to state the purpose of our run before doing it.  By stating and understanding the purpose of the workout you realize that you do not need to necessarily run fast to accomplish the phsyiological adaptation you seek for the session.   Whether you use HR, RPE, or other, it still boils down to what Johnny said.