I feed frozen/thawed because I don't want to be a rodent farmer
I have not had any problems with any of my snakes not wanting to eat, except for one girl who has been a problem feeder from the day I got her.
I pre-scent and do things pretty much the same way Becky does except I hold the rats with tongs and make them do a little zombie dance. The snakes hit them hard and fast with a strike and a a few coils. Happy snakes!
I DO make certain that the rodents are very thawed and very smooshy and war and then I zap their head with a blow dryer for about a minute...