I use 4lb flouro on my crappie/ultralight rig, and it's pretty manageable with KVD L&L, but I just recently tried it on my baitcaster. Two trips out and I'm back to braid, but I added a 4ft flouro leader. I'll see how I like that.
The reason it's exploding off of your spool is because the memory of the line remembers the diameter of the packaging spool (3inches or so), so when you put it on a smaller spool, its like a spring and pops off since it's returning to it's memorized diameter. Gene posted a video about spooling a spinning reel a few weeks back. He mentioned taking a filled spool and soaking it in hot water. It causes the line to shape to the diameter of the spool, not the spool it was packaged on. I tried it with my ultralight I just respooled with Abrazx and it worked like a dream. I applied KVD L&L and I haven't had a single tangle or pop off and I noticed the line itself had much less pronounced coils on a slack line and casts like a rocket, even with a little 1/16 crappie jig on it.
You might try both of those tricks. Just a quick couple of thoughts though.....
1. Don't use boiling water, I don't know the facts, but I could see it changing the consistency and makeup of the line, effectively ruining it
2. Don't tape the tag end to the spool while you're soaking it. You'll get the tape glue on the line. Use the little line keeper on the spool of your reel
3. When you soak the spool, make sure you take as many non-spool pieces off as you can - this includes the drags, washers, clips, etc. Essentially you want JUST the line and spool itself
Good luck, and if all else fails, use PowerPro Super 8 Slick - casts far better than any flour I've used