Yes.

This happens by design. It is called the "Thrust Angle" and is built into truck from the factory. The rear diagonal control arm (panhard bar) is designed to minimize the thrust angle changes under acceleration by describing an arc close to zero degrees under acceleration as the truck pitches rearward. Lifting the truck causes the arm to describe an arc with a negative value that moves the axle to the driver side under acceleration and back to the passenger side when driving straight. Aligning the truck to factory specs cannot accommodate for the changes in rear suspension geometry when under load. Thus the alignment is wrong under acceleration and correct when traveling under low engine load scenarios. The higher you lift the rear of the truck, the worse it gets.

You can get panhard mount weld-on extensions.

I think a better solution would be to install a fully parallel 4 bar linkage that uses the existing mount and does not involve any weldling.