In tying a bimini twist in 100# mono topshot: when it gets to the step when the tag line begins to wrap back over the twist, all is well until about half way down and then it kind of "loses momentum" and then seems to get more spread out. I tried pulling to split the loop with a little more force, more (and less) tension on the lines, etc. I have testing the knot and it seems to still hold its strength, but I have never had this problem before and it happened twice. Any thoughts?