OK, so you have ~2.5" drop (not huge, but very different than your other bike I'll bet) and agreeing with others, 52 sounds small. Stand over height really doesn't mean anything, but reach does. If you have shorter legs but a longer torso, then a smaller frame will bunch you up. Depending where you want to go with this, posting a pic of you on the bike will probably help folks make useful suggestions, but someone seeing you in person is best.