No experience with the Infusion, but on the AHPC boats, sometimes what direction the knot is tied matters, (I have no idea why), as in left over right or right over left. Also we use a double over hand knot.

My latest boat was a nightmare to hook and unhook. I tried every which way, and nothing worked consistently. I ended up making a tapered main halyard, splicing a loop on the end, and luggage tagged the ring on to the halyard. It too is crabby sometimes.