Whether or not your performance will be jeopordized is something that can only be assessed on a case by case basis.
Adding muscle to the wirery frame of a basketball player is usually not a top priority because it is easy to get too big and reduce speed, agility, vertical jump height, and acceleration. However, a linebacker in football usually needs to add more muscle to produce more power. Sometimes you simply cannot add weight.
Bodybuilders, wrestlers, and olympic lifters may move up into another weight class, which may not be a good thing. A good rule of thumb is if your sport requires rapid movement or sustained movement, think twice about adding a lot of muscle. If you need short bursts of raw power, or to maintain a high level of power over a moderate period of time, extra muscle could be a plus.
Bottom line, consult with your coach, teammates, or simply look at your performance and determine whether or not an extra few ilos of muscle will give you that extra edge, or not.
You say you have a 30 - 45min window of opportunity to take protein, etc. after working out. Does this mean 30 - 45mins after a complete workout, or does this mean 30 - 45min after working out a single muscle group?