Im strong on chin-ups (Relatively!!!Relatively!!) but on palms-away back excercises like pullups and barbell rows im a lot lot weaker, weaker than i should be for just having no biceps involved

My question is whether concentrating on barbell rows, will my lats be worked just as hard even though im using much lower weight?? Are my weak forearms/brachius (? etc) limiting the overload i can put on my lats??