First gear produces more torque at the wheels, yes, but this actually means LESS torque at the flywheel. The engine has to produce LESS torque in order to accelerate the flywheel, since the lower gears give the engine a greater mechanical advantage over the driveshaft.
In higher gears, the wheels gain a greater mechanical advantage over the flywheel, which means more torque through the union at the clutch.
Want proof? while your transmission is out as you do the clutch, put it in first and try to spin the input shaft with your hands. Then try it again in 4th. Which requires a stronger grip?