At your age and you in the infancy of your lifting you need to get into a basic progression program and let time take its course and get stronger.
3-4 Sets of 6 reps, I wouldn't worry about 3x3 yet.
You are in the 275lb class at 16, how tall are you?
Do you squat narrow or wide?
Do you deadlift sumo or conventional?
Do you bench with a wide or more shoulder width grip?
These are three things, you have probably not even really thought about.
You will definitely like one more than the other and as you progress you might play with one or the other multiple times until you find one that works best for you.
One last thing, training five days a week, is that five days in a row and the weekend off? Personally if you are training hard, you need to do two days on, one day off and then two days on.
This is just my opinion from reading what you mentioned+.
SQ - 970
BP - 740
DL - 848