Pauls knot is the best I’ve seen, he told me about it so I tried it and its spot on. I used a simple loop in the braid with a half blood knot for years with no problems, I then moved to an albright and smashed tips with it. IMO it’s not a very good knot for shockleaders for the following reason – when you tie the knot the mono naturally lies back on itself, cutting this back flush leaves a ‘blunt’ end which is the thickness of the line. You have to cut it flush really otherwise you have a tag of line facing the wrong way for casting, So, if your shockleader is say 8lb Maxima which is something like 0.25mm thick, then you have a ‘blunt’ end facing the direction of the cast which is 0.25mm thick. This catches on the eyes when you cast and the line is moving at such a speed that it coils up behind it, which causes issues.
Thats my theory anyway which may be total rubbish! Pauls knot I reckon is the best otherwise the key is to leave a tag of some description but facing back towards the reel – which is what you get when using the loop in the braid with a half blood knot on the mono.