I've been working on this knot, improving my technique as I go, for a couple of years now.
The first problem I find with those videos, and other ones I looked at, is the knot isnt tight as you wrap. I've found the best way to do it is to wrap the braid, and leader around your hands so it's tight, and as you wrap, you grab the leader in your teeth and pull tight with each wrap.
This way you can do 20 or 30 wraps (if you so desire), and the whole way will be tight and perfectly wrapped. By the time you start your hitches, you dont need to tighten at all, so the hitches just hold what you've already done (I usually only do enough hitches to protect the braid main line from the mono tag, and create 1 full spiral - I'll explain this below). This reduces burn and keeps the tension consistent right across the knot.
Also another thing I've learned about the hitches, is to not swap back and forth. Rather, go over, over, over, and over etc. Not over, under, over, under with each hitch. If you go the same direction each time, the hitch spirals around the mono, causing an evenly balanced knot. This might seam like a small thing, but when casting this knot through guides, it makes a difference. We're talking tiny weight, sure, but thats expounded by the forces used during a cast. A weight balanced knot, as apposed to a knot with a slightly heavier side, performs better under these pressures.
I tried to find a video of what I'm talking about, but couldnt. Although, I know a couple of other guys that do it this way, and they've also found it produces the most consistent and reliable FG.
So to the point, wrap tight from the start; braid in one hand, mono in the other both under tension by wrapping around your fingers a few times.
you want to avoid tightening every few wraps or at the end, for consistency.
Once you get the knack of that, you can use it on very light line too. I use this method to join 6lb braid to 4lb and 2lb leader. Very consistant contact and tension makes it very reliable.
Wish I could explain it better, but those who've been tying this knot long enough will probably know what I mean.
Cheers
Martin