Could it also be that since the Schwalbe's wear like iron, they ride like it too? I've never ridden them, so that's why I ask.

I have ridden Specialized Armadillos. They're also a "bulletproof" tire, and they ride like iron.

On one bike I run 700x25 Continental Gatorskins at 90F/100R, and on the other 700x28 Bontrager Race Lite Hard Case at 80F/90R. About 2,500 miles on each bike now, and no flats. Both sets of tires are very nice riding and plenty grippy too. Near as I can tell, they have easily another 1,500 miles in them too.

I arrived at those pressures using the formulas here as a baseline, then experimenting from there.