I dont think Shahadat will ever be a potent bowler bcoz he doent have much btween his ears! So far he hasnt shown any inclination to learn from his mistakes... he is probably trying to bowl just fast and bounce out the batters
His pace - 82/83mph- is no threat to any quality batters: sooner he realise this the better it will be for him. Perhaps, someone else needs to pass on this info to him as it seems clearly he isnt able to descern this for himself