RE: tapered swept wings vs constant chord wings?
Among other things, the stall angle of attack depends on the size of the airfoil.
In a tapered wing, the tip airfoil is smaller than the root, which allows the tip to stall at a lower AOA. Tapered wings usually have a bit of washout (tip chord line is "twisted" leading edge down relative to the root chord) the at the tip to correct for this.
Cheers!
Jim