Ok here's my situation. I bought a Reebok 7K stick over ebay. I ordered a stiff flex. i recieved a Extra stiff flex. Since im still relatively new to hockey and this is my first time buying a brand new stick. i wanted to know the differnce between regular, stiff and extra stiff flex. Is one suited more for a forward and another for D? Does size and strength have anything to do with it? I'm 5 10 165-170 I'd say i have solid strength. Not very strong but not weak at all. How will it affect my shot? i really don't want to have to package the stick and send it back so any information will be appreciated.