Like I said at the end of my post, You know what your doing, so either way you'll be safe. The guys that bottom balance do use the pack voltage to determine when to stop driving, because they know that at the low voltage all of the cells are very close to the same voltage. So even with as poor of a way to know your at the end of your batteries thay can get away with it because of the bottom balance. I'm just saying that to show that it would provide more protection from accidently driving a cell too low. Since you know all of your cells capacities, and are counting current used, and are stoping at the 70% DOD point you'll be safe with a top balanced pack.
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