I'd be interested to know how much progress she made/lost due to drifting overnight. I feel like that alone would have a drastic impact. It would really suck to check your GPS track in the morning to discover you'd lost a day's progress overnight.
I haven't read about the details, but a sea anchor can really put the breaks on. It also woulden't surprise me if they spent a a fair bit of effort doing weather routing, making course adjustments to take advantage of weather systems as they evolve.
I'd be interested to know how much progress she made/lost due to drifting overnight. I feel like that alone would have a drastic impact. It would really suck to check your GPS track in the morning to discover you'd lost a day's progress overnight.