I tried two from Lush as they were a gift before I realised that the company were not as ’fresh’ as I had been led to believe. The other two I tried were soap shampoo bars but not marketed as soap. non sulphate cleansers weren’t readily available here and these companies sold their products as shampoo and even had solid conditioners for sale. I never tried those but I did try vinegar rinses. There was a lot of smoke and mirrors tbh and I read plenty of reviews along similar experi to mine with both@DMack when you say "shampoo bar," (the one you used after the Lush bar), was it actually a bar of soap? Many people do experience serious hair damage from using soap on their hair. I don't consider those "shampoo bars" for that reason. The shampoo bars we are talking about in this thread are made with syndets and do not contain soap.
Have you tried any of real syndet shampoo bars, other than the Lush bars? Lush bars are made with sulfates, which are way too stripping for my hair and irritating for my scalp. Most of us here use recipes that contain no sulfates, only the same ingredients used in non-sulfate liquid shampoos (but minus the liquid). If you haven't tried one of those, maybe @KiwiMoose will send you one of hers.