You have to capture premium for all strike price with regular interval (whatever interval you are following) & refer only 3 strike price with highest OI in OTM (call or put). If any changes happen in strike price with respect to OI, then you already have recorded premium value of the new strike price. For this you have to automate the premium decay system. Or else you may record 5 or 6 strike prices premium with highest OI. In most cases strike prices didn’t go away beyond this limit in intraday basis.