Gif Para Twitch Alert

Guys, another disappointing night at Cremorne point wharf. I'm getting plenty of bites/nibbles but my hook-up rate is pathetic. I only caught one Bream in the two hours that I was there. I'm guilty of using a heavy line (15lb). Is that the main reason or am I using the wrong hook for bream? Is it my technique, I generally don't Jerk the line at all when I feel the nibbles as I've read its best to let the bream bite the bait and hook themselves (not sure how true that is).