my right bicep is about 2-3 reps stronger than my left. For example, if I curl a 45lb dumbell with my right arm, i can do about 10 reps. but my left arm is only good for about 7-8. should i limit my right arm to what my left can do or train the both to the max? So should i go ahead and do the ten reps with my right arm or stop at 8 to keep it even between them?