Arms
4 giant sets for tris and bis
Arm is only 15.5 if I can actually build it to 17 it will look freakish on my tiny joints
You can't.
You can add that size if you gain a substantial amount of weight, but this is what you have, and always will, unless you do something drastically different. Think about it - what could you possibly do that would change things that haven't changed in 20-30 years?
Instead of focusing on a 1/4 inch of something that will make no material difference to anything in the world, why not push that focus on something productive?