Upside Doom/Doomside Up

I've bolted up two lines in the main Cave at Llanddulas. Upside Doom and Doomside Up share the same lower off in a hole in the roof (a la Giggleswick). I was hoping the hole would have a jug in it but it wasn't the case so i've left a sling on the lower off, the last move of both routes is to grab the sling. The right hand line (Doomside Up) is pretty shit cos its basically one move (grabbing the chain). I did this but it seemed really hard to grade, the last move was quite powerful so maybe its 6c, maybe 7a, i'm really not sure. The left hand route (Upside Doom) has a bit more sustained tricky climbing on it so is a lot better. The route is pretty powerful and has some cool moves. I did it today and think it is about 7c/+.