Assist feeding is very stressful for the critter. I wouldn't do it more often than once a week.
If you can manage to chain two small feeders whose combined weight adds up to an appropriately sized meal that's often easier to get down the hatch than one larger feeder. If you have f/t feeders I would feed them wet or at least damp, as debilitated snakes are often dehydrated and it can take them a while to recover.
Also triple-check your temperatures to ensure the temperature is correct on both the warm and cool sides.