Hi Lyle, Thanks for your quick reply.
I forgot to mention in the original post that I'm male and 39 years old. Just for completeness' sake.
As for your suggestion: I am already doing the carb refeeds once per week as directed in the book. The only difference being that I found difficult to stuff myself with 400g of carbs in a 5-hour timeframe, so I start earlier (around lunch) but consuming the same amount of carbs (~3g/kg LBM). Are you suggesting I do a longer refeed (2 or 3 days, like a Cat 1 at the end of the diet)?