How important is it for R line to be a mirror of the T line?.

I can see that in every instance, there is a way for the R line to be a reflection of the T line. But in each model, I can see that it doesn’t have to be…that the result can be something related, but not directly related to T. Like at times, I try to make it match the T line but it feels forced – ie…can still be true, but not the obvious R.

Is this an indication that I’m not doing the model correctly?