Strange thing for me is that when I get irritation with an SE shave, it lasts MUCH MUCH less than when I get irritation with a DE.
You're not alone! - With the SE blades being so much thicker, I don't think they cut quite as deep, if you get careless and give yourself a small nick...it actually is a small surface nick, as opposed to having the likes of a scalpel making a deep cut. I'll take it even further, an Injector actually seems more forgiving than a GEM or FHS blade, probably as it's thicker yet.
I do take issue with calling an FHS total garbage, they do give 4 good shaves in my OneBlade Hybrid, and I'm using one in my Genesis (Black Friday 50% Off gift to myself) will go for shave #5 tomorrow. - Admittedly, in the two original Core razors, I got MAYBE 2 good shaves out of one, so the heads aren't identical, regardless of material, and the Genesis seems to shave closer than my Hybrid. (I actually gave myself some weepers on the upper lip the first two shaves, until I cranked down the amount of pressure used with the lesser model considerably). The blade kits (30 blades + a bank were also 50% off at $14, shipped free for Black Friday as well, so I grabbed 3 sets with the Genesis.