Like others I also make my own braided loops. The only innovation I can claim is to use TWO silicone tubes. The braided loop is about 6" long, 3" 0f which is slid up the fly line and the other 3" contains the loop. One of the tubes is at the top of the braid on the fly line and the other covers the fly line/braided loop join. This is the part which gets a blob of superglue. I never get a cracked flyline unless the line is several years old. The extra silicone tube seems to take up the flex and strain on the upper fly line/braided line so avoiding the cracking.
Lyall