I'm with Tom here. Obviously your arms grow easily...you shouldn't be focusing on all that arm work!
drop most of your curls, and work on your back! pull-ups, deadlifts, barbell rows. LOVE THEM.
i also agree with yi5hedr3 and Karky...arms should be last in your routine (and even skipped occasionally) and make sure you're using your back muscles for back exercises and not 90% biceps.
on trick that works there is using straps and doing some lat pulldowns. don't grip the bar very tight...let hte straps keep it in your hands. then really focus on pulling your ELBOWS down, and feel the emphasis in the back and make sure your biceps aren't straining. drop some weight off the stack too for this...it should be work, but lower it so you can do it easier and focus more on your muscles, less on the 'workout'.
you should always be evaluating your form and what your muscles are doing. no one's an expert at this without years of experience, and learning from lots of others who share their wisdom.