Sereral well-respected 18 sailors weighed in here:
viewtopic.php?f=13&t=14768&hilit=halyard+knotI added electirical tape over the knot to help further reduce the profile. Also, FWIW, I mentioned using "Sailkote" to help reduce friction when raising the main the other day. It bears mentioning you will need to totally re-apply the spray on both the bolt rope and sail track if you ever dump the boat in the water (like I did the other week - ugh!). But trust me, it makes a world of difference. Good luck!