Drag setting question on electric reel

Hi All,

I've been fishing for a number of years in sal****er and have never have any
problems landing big fish (60 - 120 lbs.) on lever reels. However, I
recently purchased a Penn 114L and an Electra-Mate 940 XP electric motor for
the Penn. A few days ago I ran into something big. The fish was probably
either a large Warsaw or Golith Grouper. The fish was definitely in the
neighborhood of 200 - 300 lbs. I had the star drag set as tight as it would
go and the damn fish kept taking line like there was know tomorrow. I may
be
mistaken but can't Star Drags be completely locked down like Lever systems.
The problem came when I tried to reel the fish up. The motor kept spinning
and the line kept going out. Could someone explain this?

Thanks