I have an irrigation system at my house , its sandy soil and PVC pipe  4 to 6 inches in the ground .

I'm biased so probably not the best to talk ;-) but if I was going after a property with sub-slab vents, I'd make the inspector scope every inch.

If it is off by 1-2 inches then I would probably not worry about it for now unless there is more movement. 

We had a wall about 2 inches out of plumb, horizontal block displacement in a corner (right by the gas line) and a bad drain tile system.

The bow was 4 inches on each side.

If you are concerned another buyer might inch you out, and you really want it, you can probably add an escalation clause that bumps the price above the next highest offer, up to a certain price limit.

The cracks are not wide (< 1/4 inch)Thanks for any input!

There is a type of brick veneer that is actually brick material and is about a half inch thick.

Hairline to just over 1/4 inch at the top.

For the seepage, saw cut an 18 inch wide trench along the foundation, install drain system into a sump pump.