Making progress! (with f/t)

[Lolo76]

I've been wanting to convert my snakes to f/t for a while now, mostly to save both time and money. Finally starting to make some progress, and if you include the corns I'm over 50/50 with them now. The Balls are still being stubborn, though, and only a few are consistently taking them. Here's what I fed last week, and who ate (or didn't eat) what...

Julius: 1 rat
Nerissa: Refused mouse (she's on a long fast)
Delilah: Refused mouse
Orlando: 2 mice
Dave: 1 rat
Toby: Refused mouse
Rosalind: Refused rat
Mona: Refused mouse
Vinnie: Refused mouse
Kipling (JCP): 1 pinkie mouse
Corn snakes: 4 took a mouse, one refused.

Should I continue offering only f/t to the picky ones, hoping they will eventually take it - or switch back to live for a week or two? I don't want them losing weight, especially since they're still growing, so I'm afraid to starve them into taking frozen. Also don't want to keep throwing out the leftovers! Any advice, tips, etc?