I think it just boils down to what works for you and your snakes...the most important thing is their well-being. I've heard of snakes going off feed for 6+ months... if they're not eating, I can't really give you much advice, but it doesn't seem best to change up anything during a hunger strike... they'll decide to eat one day, so as long as they're not rapidly loosing weight, I think time is your best friend