So did you mis-measure your inseam or not? That and other wrong measurements will make any sizing recommendations sketchy, other than a experienced and trained eye. Or perhaps your personal desires for how you think a bike should fit.
Big thing is look at the genre the bike is made for. What is the typical position that professional and real serious riders have when riding that genre of bike. If you are wanting a different position than they ride in, then sizing recommendations are probably useless. I'd also suggest that if you want a different position than norm, then that's probably not the correct genre of bicycle for you.
So maybe if you like the 52, get the 52. Like any purchase, I recommend you don't spend so much that you can't get another bike if or when you find out you should have gotten the other size.