Asking 4 a friend.

Ok fine it's for me.

Stats:
6 feet
225lbs
12%bf

So I got these big old boulder shoulders. I'd say they're easily my strongest, most developed body part. HOWEVER it makes my arms look small. I mean I have 18" arms which isn't pathetic, but my bowling ball shoulders make them look like tooth picks.

I'd like to hear some success stories on bringing up your lagging body parts.

What did you do?

-train them more?
-train them less?
-more reps?
-more weight?
-yell at them to grow?
-threaten them?

Let's hear some success stories. Gotta get these arms up.

Thanks in advance.