How about just using imp vol to project the next day(s) range? (Imp vol * sqrt (days/365 * Probability Factor) ) * Price Probability Factor (i.e. Standard Deviation) is selected by trader depending on market/historical volatility fudging a little if needed. Is it the greatest, prolly not ... shrugs its all I got.
My apologies… I thought you were @steve46. I should have done a quick check of post-history. Doesn’t change the argument but I wouldn’t have come across as such a hard on.