This was my first 7c+, probably my only one in fact. I think I did the start move three times - once to prove I could do it, then on two redpoint attempts. No idea how to grade it as its basically a strength move - I even did at bit of a scream. I don't remember any baffling slab move at the top, but I did drop my first redpoint on a tricky section moving left below a little roof at half height.
Basically have a play on the start to see if it possible, then forget about it until you wired the rest.