Have you tried taking arrows off? Switching sides?

If their phys/ment is fine, what is their attacking? (mine are usually like 5 to 10 difference like 60/65/70 ..or so)

Looking at your team, do you always play 3 only in defense? This might account for your opponents' efficiency to a degree as well. It is quite strange to have a defense man from 3 in the back be one of you best scorers..