Knee Strain

So I enjoy the occasional cruise on my longboard, the deck of which was made by a friend of mine. Everything goes swimmingly except from time to time, i get this pain in my left knee. I believed it's cause by the pressure on it when i am pushing around, and when i drop my right foot to slow down. Other than that it feels great. I suppose I could losen my trucks a hair so i could carve to control my speed better, but then i'd get speed wobbles more easily when going faster. I think I'll do that, and carve my way to comfort.