Context: Riku, the protagonist boxer of this manga, is fighting against an evasive opponent that is really good at dodging punches and who always tries to win on points rather than KOs. Riku tries to punch him without success, while his opponent manage to hit him with punches that are not so powerful but let him gain points. Riku's trainer tells him:
What is the meaning of 欲ばっから? Is it 欲【よく】ばる+から? Or has it something to do with ばっかり? In any case, could you please explain the word formation?
Another thing I don't understand is the させろ at the end. Why wasn't しろ used instead? Is he ordering Riku to do something or to make to opponent do something? Anyway, here's my translation attempt:
He is taking advantage of your greed!! You should focus on the least powerful punch. Concentrate your strength against the least powerful counterpunch!
Here you can see the whole page and the one after it for more context. Thank you for your help!