No problem If you're looking for a slightly larger helmet size I'd definitely recommend the TM helmet. Great quality and a teensy bit larger than the other screen derived kits.
Sell the RT-MOD and get ATA, AP, VT, TM, MC, DA, CAP-W... anything really. Your height and weight are pretty spot on for what the troopers in the movies were.
It seems to be a common mistake, yeah.
The only people who might notice are nerds like us. It's up to you if you wanna change it though unless you want to go for EIB or Centurion or something.
The tube stripes are on the wrong sides. The curve on the the last stripe just above the mic tip recesses curves inward when it is on the correct side. Other than that it looks great. Awesome work on the ears!