Torque and brace height aren't necesarily related are they? One issue is erors that lead to inaccuracy, these might be things like droping the arm early in follow through, or torquing the handle.

The second issue is how those erors are showing up in your results on target, and what the bow does to mitigate or propogate those results. So in this case a low brace height bow might still be pushing the arrow when you drop your hand or torque your riser - bad. In that sense the low brace height is really a time issue, like locktime in a gun. Maybe you goof the shot early, but if you goof it later, and it is still on the string, there is going to be some effect. To me, time affects us all the same whether we are long draw or not. On the other hand a longer draw person may be able to use a heigher brace height and still get decent performance, where the shorter draw length person would be forced into a lower brace height bow.

Another issue is that with a low brace height bow, or an overdraw, the distance between the string and the rest is shorter. Whether that maters or not I don't know, but it could sort of wedge the arrow off course if the arrow is in contact with the rest at all.

There is also the bows delta form. A high brace height bow may have a more stable geometry due to the more arched shape it has.

Overall, I think we have to be careful to put too much emphasis on brace height. What kind of a curve is it? we know at low levels it makes a bow hard to shoot, Most shooters would notice the difference between 5.5 and 6.5", but is there a big difference between 7 and 8"? The mathews C2 is very easy to shoot accurately, and so is the rival pro, the former has a 7" brace height, and the pro has an 8" brace height. I can't really tell the difference, overall, I prefer the C2.