Forearm problem when doing bicep curls

Hi all,

i have been training on and off for the past 2 years. Im the classic ectomorph - lanky and dont have much muscles.

For the past 2 years, what frustrates me the most are the two bicep excercises. Namely dumbbell and barbell curls. Firstly, just in case it is of any relevance - i've always been following the MAX-OT routine for training. The curls frustrates me so much because when im struggling with the last 1-2 reps on my right arm, it feel and seems like it is the forearm that is struggling to lift the weight and not the biceps - which is what i'm training.

I'm heavily right handed person so i thought my right biceps should be strongest, but often at times when my right arm is struggling cos of the forearm problem, my left arm can do the same amount of reps and more and not feel the same forearm problem.

i've seen the physio and he believes it might be due to my right forearm being overfatigued because i used right hand for my mouse at work and home. i've also spoken to a friend of mine who follows MAX OT and he believes it may be due to muscle imbalance of the forearm being stronger than it should.

please has anyone experienced a similar problem? if so are there any ways i can improve this? i cant help but feel frustrated with myself everytime i do biceps cos it makes me feel so helpless although all other exercises are fine and i can overload the right muscle groups properly.

thanks,
al