Not sure this will help anyone, but figured I would share anyway. I have a strange problem with my 12wt and an integrated shooting head line - the loop to loop connection between the fly line and backing hangs up on the guides (they are the flexible kind and seem to flex too easily) when pulling hard on big fish. It first happened on an albacore trip. It happened again with my striped marlin in Mag Bay. When you are about to get fly line back on the reel and you can no longer make progress, it is not a good feeling. Fortunately, I had someone to push the connection around the wire in both cases.
Figured I needed to come up with a solution before I lost a lifetime fish because of it.
Here is what was happening with a traditional loop to loop connection where both loops of the double bimini in the backing go through the fly line loop in the same direction - guide stuck between fly line and backing

A different view of that connection

If instead of passing both loops through the same side, you pass one in from each side like this

You get a connection that can't hang up


I normally pass the spool of fly line through the loop twice to make sure the backing loop doesn't wrap on itself instead of the fly line. Doing that with this 2-sided method makes a connection that cannot be undone. I did that for the first test and had to cut the backing to get it off the fly line.
For those that are not familiar with a double bimini:

Figured I needed to come up with a solution before I lost a lifetime fish because of it.
Here is what was happening with a traditional loop to loop connection where both loops of the double bimini in the backing go through the fly line loop in the same direction - guide stuck between fly line and backing

A different view of that connection

If instead of passing both loops through the same side, you pass one in from each side like this

You get a connection that can't hang up


I normally pass the spool of fly line through the loop twice to make sure the backing loop doesn't wrap on itself instead of the fly line. Doing that with this 2-sided method makes a connection that cannot be undone. I did that for the first test and had to cut the backing to get it off the fly line.
For those that are not familiar with a double bimini:
