u got the point Gcoe.Visiting an msk physio for proper diagnosis is the key to getting solution to this condition.The postural Wikipedia reference-linkscoliosis has thrown a compensatory shoulder level assemmetry which could be secondary to a sustained muscular activity.Prolong muscular activity could potentiate trigger points in the active line of both trapeziod and romboid ms.Overhead activities could hv triggered the trigger points and hence the muscle tightness.U need to see a physio for proper management.looking forward to seeing u out of the situation very soon.yelufem.