Hello Checkers,
I admit, I kind of skimmed through a lot of these posts. I just want to say that I too wanted my snakes to strike and coil! My baby snakes seemed to lack a vigor for eating that my 2 bigger snakes had. They preferred to eat alone, just set down the mouse and leave it and they will slowly creep up, nose poke it a few times, and eat it daintily. It can take awhile, but I slowly helped my snakes gain more confidence and now they all strike and constrict like champs!
Basically, I started by stretching out their feeding days a bit. An extra 1-2 days will make them really hungry! Like I said, one of my snakes was pretty timid about eating so I had to start by just getting him comfortable with me being nearby. Then I got him to eat the mouse while the tongs were still grasping it. After that, I'd start wiggling it just a bit, or very slowly swinging it back and forth. This was the hardest since they never had to strike at anything before, and for a few weeks I had to eventually just stop and let them grab it normally, but in time they started striking! Just an inch or so away at first, but now they will launch across the tub to grab them!
Now, once they are striking, that's great. When they start getting a really good grip, you can gently "wrestle" the mouse, wiggle or tug it just a bit so they know they need to "kill" it. They might not do it on the first try, or it might be a really lame attempt! Keep trying! Practice makes perfect!
It sounds like your snake is already further along then my snakes were, so I'm sure you can "teach" your snake to coil like mine. I find now that they strike and coil they eat more vigorously and also are more active and confident and will come prowling out more. I guess this could also just be them growing up more, but I can't help that feel their confidence was boosted.
I hope this helped, and you will consider trying this before resorting to a live feeding! Just remember don't rush it.. for my snakes it took the better part of a year. I think if your snake had a live fuzzy it may not even coil it if it hasn't coiled before.