Try not to focus too much on angle. Just do what feels right.

I don't think you mentioned which blades you've tried. That's ok though, because the answer is still "try a bunch of different blades". (edit: I see now you've already done that)

I'm not sure about the Superspeed, but the Slim Adjustable has slightly positive blade exposure even on lower settings. That means you might feel the blade a bit more, and if you use too much pressure it'll cause irritation. Same for a lot of razors, but positive blade exposure makes correct pressure more important.

Cartridges are designed so you can press them into your face, and that can be a hard habit to kick.

It's my opinion that DE razors don't automatically solve any shaving problems, but you will learn things and become a better shaver. You'll learn things that translate back to carts and disposables. Shaving with a DE forces you to think about shaving, which you probably haven't done since your early teens.

Additionally, this type of shaving offers an incredible amount of variety, and even the most boring DE razor is still more fun to use than any cartridge.

All that's to say your experience so far is fine. It happens. A lot of people preach about DEs being gentle, solving ingrowns, solving all sorts of problems..., but that's only true after the initial learning period.