1. Thanks for providing your review - I'll also look into your observation about 10th to 25th.
2. The values in NF worksheet are always NF-1 (ie current month). On the expiry day, you may enter new series' values.
3. For scalping, you may try out the stochastics oscillator by buying when crossover is below 20 and then a pivot high breaks, and selling when crossover is above 80 and then a pivot low breaks.
The parameters for this stochastic oscillator is provided by .Pride. in his thread
here. I use & observe the above settings in 5min chart for scalping.
4. I hope you have also gone through the 60min flow method. You can read more about this
here