5'8 Quad Batwing Shortboard problems

Hey guys,
I have ridden tons of boards in the past six years. With this board (I got it off my brother for free), the board feels like there is not enough weight on the nose at all. I know everybody's going to want dimensions but the board is almost as wide as my fish and has kind of a rocker. I'm guessing I need to try this board on at least head high?? I had a couple of ok rides yesterday, but nothing compared to what I usually get. The waves were about waist high maybe stomach at best. The board is a quad so it was going so fast that when I tried to lightly bottom turn the board basically sunk. I wasn't leaning too hard because I've done basic snaps on several types of boards. I'm wondering if the dimensions just aren't meant for me? I'm 5'8 and I weigh 135 lbs. Any suggestions on how to better maneuver this board? I only got a couple of floaters out of it yesterday and it landed really weird. BTW, my other board is a 5'5 19 1/4 lost round nose fish and it rides well in all types of waves and conditions.
I have ridden tons of boards in the past six years. With this board (I got it off my brother for free), the board feels like there is not enough weight on the nose at all. I know everybody's going to want dimensions but the board is almost as wide as my fish and has kind of a rocker. I'm guessing I need to try this board on at least head high?? I had a couple of ok rides yesterday, but nothing compared to what I usually get. The waves were about waist high maybe stomach at best. The board is a quad so it was going so fast that when I tried to lightly bottom turn the board basically sunk. I wasn't leaning too hard because I've done basic snaps on several types of boards. I'm wondering if the dimensions just aren't meant for me? I'm 5'8 and I weigh 135 lbs. Any suggestions on how to better maneuver this board? I only got a couple of floaters out of it yesterday and it landed really weird. BTW, my other board is a 5'5 19 1/4 lost round nose fish and it rides well in all types of waves and conditions.