Ok, here is where the confusion is as to why you think it is assymetrical while everyone that looks at it sees a symmetrical tartan.

The thread count, as you have written it out, if woven as an assymetrical tartan (repeating the same thread count, left to right, without reversing), will yeild the tartan that you pictured in the other thread, which is -- as it turns out -- a symmetrical tartan. But the symmetry is actually within the thread count you designed.

The normal way to write the thread count for this tartan design, which woven as a symmetrical tartan would yield the exact same tartan as you have pictured, is this:

R8 K2 A36 DT22 LG22 DT4 LG36 K2 B8

The red stripe and the blue stripe are the pivots in this symmetrical design.

On the other question, if the sett repeat is 7.3" as you say, then yes, this will be good for kiltmaking.