Printing quality is inconsistent w/ logo sizing also stretched and logo not balanced with the shirt

The quality of the shirts are getting better, however, the printing quality remains the same as before, with some yellowing around the print area and the printing ink seems to change from shirt to shirt. Not sure if they are made in separate locations or not. Also, the logo seems stretched dimensionally in the y-axis vs. other shirts. The logo is also really big on some shirts (S-sized) vs. other shirts (M-sized). Perhaps it is due to me using an old order. Next time I think I need to double check logo sizing, positioning, etc. It would be helpful if Sticker Mule would assist with this as they see and print so many shirts. It would be nice that the logo size increases consistently with the shirt size. Just seems all over the place. Little frustrating.