Hi Chad
I own a Liquid Force Havoc 2007 14m and I think the bar is similar to the assault (unless you have the 2:1 pulley stuff)
When I first flew this kite, I had the same feeling where the rear lines were slack and lacking of turning speed. That was in light wind.
A friend of mine suggested to measure the rear lines compared to the front lines.
They were exactly the same length, which is OK. He then suggested to try having them the same length when the bar is half power. I did that, but it
was too much. I was way overpowered.
At the end, I added an extra knot to the rear lines, so I can shorten them a bit more than what is suggested. You may already have 3 knots at the kite
and 3 knots at the bar. I added a 4th one at the bar. In very light wind, I use it.
But the most important, I relasize when I first tune my havoc the first time and I had the problem, I think the kite was not inflated enough allowing
it to curve more than suppose, and may be that would make the rear lines longer.
So make sure it's well pumped, try different setups in light winds, and add an extra knot if you feel you need it.