Ferrari would be better at F1 even with me at the strategy desk. Bone dry track, few drops => BOTH CARS ON INTERS
Why not try one car (use Kimi since he's the guinea pig for everything and he's gone next year anyways) and have Vettel (who is still, by a long way, a title contender) wait the results. At the same time he can see what Hamilton can do on slicks so he has ALL the info to make a good decision (and no time lost)
Granted, he did screw up a couple of times himself (Germany being the worst, crashing out of the lead) but strategy wise the Scuderia are a joke...