The romantic bits are very sweet, I agree, but I think it's a bit soon to tell? If you haven't seen the most recent pages you might want to re-asses that evaluation. There's currently a strong sense of foreboding, though I don't know specifically where it will go.
Though if the leads are just too sweet for you, then that might not matter! Everyone has their taste so no worries. I like quite a wide range from dark and morally dubious to light and sweet, personally, so I'm on board to see where it goes. I'm sorry to say I don't come across historical fantasy that often, so I don't have any other recomendations that have that historical time period feel.