Easy - try it both ways and see what way it drives better.
The Goodyear chart gives you the minimum recommended air pressure to carry the load, thats all. The point the alignment shop makes does indeed somewhat make sense.
I'd try it at the lower recommended pressure from the chart, then try it with the air pressure up as recommended by the service guys. Neither one will be unsafe, for sure.
Also keep in mind new tires do sometimes need a little "break-in" period. I've often found it takes 500-1000 miles for a tire to settle in to the way it's actually going to drive. And with 7 vehicles in our house, we buy a lot of tires.