Enve specs a max 700c x 50mm tire for that fork, so I would guess that you can squeeze in a 52mm tire.
I can't really tell you whether it gives a smooth ride, as it's the only fork I have used on that particular bike. As for weight, it's 540 grams, if I recall correctly. I don't know if you will find anything much lighter for the tire clearance you are after.
Here is an alternative that gives a bit more tire clearance and mounting points, albeit with more weight.
I will say that the Enve fork is nice: internal routing for a brake hose, very tiny and discreet fender mounts (in case you ever need them), and does exactly what I expect from a fork: holds the wheel out front and helps steer the bike(!)
