I should immediately declare that I hate braided loops
however they are a (sometimes) necessary evil.
Firstly I use quite long braided loops, mainly because I think the short ones are gash and really only suitable for use where presentation isn't an issue (so mainly on sinking lines for me).
The way I fix them is to firstly stretch the braided line over the end of the fly line and down as far as it will go until the end of the line is butting the braided loop proper. I then use three of maybe four fixing spots with waterproof superglue spread at roughly even intervals over the length of the braided section, but never at the loop end - I think it just causes issues at the end of the line to whack on a chunk of glue so from the loop back down the fly line I leave around 2 inches (miniumum) before I 'fix' the braid in place.
Once all of that has set I then take the silicone tubing down over the end of the braided line, sometimes I put a wee drop of glue here too to make sure that it stays in place.
Et voila nicely fixed braided loops that don't eat the end of the fly line.
Ofcourse, I'm tempted to say just fit a nice tapered leader instead - much better
H