There's always delta hedging down, which is a possibility. To come back up to 1600 seems a little unlikely, given the short-term pattern I see. 1540 works just fine for me, though, and we could definitely come back to 1600 in a wave of a larger degree by opex. I guess right now the cautious bearish stance is that this is a C down off an impulse that ended at 1628, so if C=A then 1540 will do the trick.
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