I think Ferrari should trust the initial strategy and the drivers but until Pirelli give the teams tyres that can just be raced hard I don't think that will happen for most of the teams as everyone is scared stiff of the undercut so as soon as any of a teams main competitors pits they do the same. The only top team that seem to trust it's driver is MB with Lewis and to some degree depending on the strategy RB with Checo. The moment Ferrari reacted to RB, who were always going to pit early being on the soft, they were on a loser and when they reacted to RB the second time they had no chance as it meant running the hard or the soft and probably doing another stop, which they had to do in the end anyway. I'm sure Ferrari's original strategy was more or less what they did with Carlos. They just need to hold their nerve and stick to the plan, it can't end up any worse.