NIfty Intraday - more likely to get short side trade

Market is trading comfortably above 18800 since morning. now CE and PE OI are equal and chart suggest some short side play. so I am looing to Buy 18800 PE of Dec expiry or 18900 PE of today's expiry. I will initiate the trade on short side if nifty sustain below 18780 for 15M. if this condition is met then I will open my trade with 18850 as SL and target would be 18650 from where we had started this bull run yesterday.