I don't like saying this. But If you had secured the Braid properly you would not have lost it.

You cannot needle knot a mono core line
There is nothing wrong with braided loops,if you just use a bit of care when Installing them.
If you must use the plastic sleeve.then it has to be superglued.
I do not use the sleeve.I whip mines in place.
If you do not have the tools to do this, then get some fine mono and do a nail knot at the end of the braid,and put a tiny drop of s/glue on the knot.
This will never come loose.
Badly made commercial loops(there are many) do not have the loop secured. to the main braid.A tiny drop of S/Glue sorts this.
A well know shop.sold lines with free loops for a while.The braid was far to big for the line.This has now stopped.
Jim