My pleasure Fawad,
1) to calculate area spring, you have to divide SBC by settlement and multiple with safety used to calculate the SBC. Normally, Geo-technical engineer take 2.5 to 3 as safety factor. ((SBC/Settlement)*FOS).
2) I am really sorry, I don't have the Ultimate Version to check. I used to have it, but I don't remember if I check the punching on the foundation or not. I done it on the floor slabs and it is working fine. Try to create a raft slab instead isolated footings and check. Maybe the footing too small where the punching shear parameter fall outside.
3) I didn't tried to use any of these.