36 puts + 20 calls were delta neutral at the entry . I could of choose any interval ( 100 , 200 , 400 shares) and PnL would of be very similar. Based on stock's action , 100 shares adjustment would yield the best PnL even after larger commissions. The bigger the interval---> the bigger the profit per trade, BUT less occurrences. Not sure if I understand about extreme fade points ; I have my own Excel file with B&S that calculates adjustments via stock based on the Last price. Its simply tells me to buy ( or sell) the new unit , which I set up on 200 on this trade.