I concur. It will look a lot like a faded flannel shirt, which will do fine if you really want a subdued hunting tartan. It's not really bad, it just doesn't "pop."

It's tour tartan so you can make it what you want, but I would advise going from gray to a blue-gray color, but not such a subdued one, and get a little more contrast in the smaller stripes, maybe brighten them up a bit as well, but the tan "base" could work well and would be a nice departure from the hum-drum green and blue based tartans.

I really like the design, just not the color choices. I wouldn't change the thread counts unless you just want to tweak the sett.