I saw pics of you and I would be happy with your arm size.
At your current state I guess you should use some tricks to shock your arms.
How about giving your arms their own day [biceps before triceps and then forearms]. Forearm training is important, too.
Set arms on priority for a few months, before other body parts.
Train arms twice a week in the 8-15 rep with less than 1 minute rest between sets to get a good pump.
Use wide grips and close grips, dont do what you do on a regular basis.
What helped me were the fat gripz and fat gripz extreme. A lot of people told me its shit, but I had good results with it.
Its worth a try and not that expensive. Just a suggestion.
Like I said above you have a very good arm development.
I dont think a coach knows more than you already know.
Why dont you train with a partner who forces out a few reps and a bit competition could help also.
