I always torque my clutch springs, did you measure and check the spring length before assembling the clutch?
I you don't have a torque wrench, invest in one. I cycle as well and had to buy another one 2nm to 12nm or I could crush the carbon frame.
have you adjusted the clutch properly, also could be binding. take off or loosen the clutch cable and with the engine off, engage gear and see if there is resistance when you turn the back wheel.
Its just a process of elimination