Less lift in a slip?
Ok, I'll bite on this one. Yes, there is.
As the effective lift acts perpendicular to the leading edge (check your swept wing aerodynamics) then there will be slightly less lift.
However, I believe it's the significant increase in drag which is the major factor.
Abgd,
As one is releasing the slightly increased back pressure on the controls, the risk of stalling is not an issue when re-establishing straight flight.