The approach outlined in my post led to rapidly increasing my zapping amount, while still more than breaking even everyday.
What I've learned since then is that a rigid system eventually becomes gamed by other stackers (usually unintentionally), so now I'm less systematic about how much I zap.
I have noticed this a bit, too. Each person has his own policy on zapping, but when someone continuously doesnt zap, it gets a bit annoying.
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