Long jump distance help?

This whole summer I've been in the gym working out and I'm trying to go to state in long jump and sprints. I've been doing plyometrics box jumps and lunges with weights. My best distance was 16'10 and I'm going to be a junior this upcoming school year. Well I've noticed that I'm jumping higher vertically but if I'm jumping higher would it be the same if I'm gong horizontally for distance in the long jump? I don't only work on my legs I also work upper body n core also. I've also been gaining weight that I'm trying to turn into muscle wouldn't the weight help me go farther. I think it would because I'll have more momentum and I think of it like which can you throw farther a balled up piece of paper or a rock lol. Thanks for your answers