Aw, y'know I am getting a little teary at your last post because I can SO relate!
My first, Natalie, was a baby who cried a lot. It feels just dreadful when you don't know why your baby is crying - it feels like a personal attack!
My only advice is to ignore people who are telling you you're doing it wrong. IGNORE! And also books - there are loads of books out there that people might recommend, but if they tell you their way is the only way then IGNORE! The key is confidence.
And those babies that are swaddled and put in bed without a peep... Have you seen this with your own eyes?!? I would reckon these are exceptional babies, not the norm.

How often does your baby feed out of interest? I was told that feeding my baby more often than 2.5 hourly would make her feel full and sick and was not a good idea. I am now pretty convinced (although of course I will never know for sure) that Natalie was just hungry. I rarely gave her top-up feeds because I was worried that it didn't fit in with the 'routine'. Once she was 6mo I was feeding her VERY frequently overnight because that's what we did when she woke to get her back to sleep - she wasn't a co-sleeper (and neither was I TBH). She was a much happier baby at this point! It could be that at 6 months she turned a developmental corner and expressed herself in ways other than crying, but for me it was an indication that it's ok to feed your baby outside of what others deem to be appropriate, KWIM?

But feeding aside, I really think there are babies who need to cry more than others. You are doing a fabulous job.