Doing weight training, you should expect thaqt you're going to be sore-there are ways to minimize that annd get a better recovery, but it's ver common to be sore, and usually that's not a problem.
Sport, especially when competitive is quite often a game oof inches with every availavle edge being used to separate the winners 
from the losers. There are ways and exercises on exercises to improve vertical leap likee what 
NBA players do. Keeping your workouts short and intense, and combining weight lifting with 
plyometrics is how to increase your vertical jump fast.