Turk's Head

[Brion Toss]

Hello,
Let's say you have tripled the knot. As you draw up, the part you are tightening will compress the other two parts on one side of the knot, and be in the clear on the other. The compressed bits can be easy to distort, and you'll gett a mess that is very hard to straighten out. So on the compression side, move all three parts, all or partway through the knot. Drop off the two you are not tightening at the other side. Tighten the strand you are working on back across the knot to the compression side. Repeat. This is one nice detail out of a host that you will develop, in increments, as you get to know the knot.
Since it will obviously help to see how it's done, I can honestly recommend my Fancywork video series. The first one covers Turk's Heads.
Meanwhile, just remember little-by-some, and keeping the knot symmetrical as you go. Oh, and once the first part is drawn up, do the next one to exactly the same tension. Likewise the third. After each full pass, then, you should have a smooth, balanced knot. How tight you eventually go, after say three or four passes, is up to your skill and energy.
Fair leads,
Brion Toss