I don't run CKD but I will often adjust the duration between refeed days based on my BF% (in light of the fact that leptin levels are correlated with one's percentage of BF).

but mine are still high
16-18%

I can't say reliably because I don't know exactly how hard you exert yourself at work - but I would follow your instincts on this one - if you feel really depleted by day 4 - go ahead and have your high carb-up on day 5.

I will re-iterate that people with higher BF% generally require longer periods between refeeds/carb-ups....essentially because it takes longer for their plasma leptin to drop low enough to warrant the refeed.

But try what you were suggesting and see how it goes...and if you aren't satisfied with your progress...try to stretch your no/low carb period to six days.....the refeed isn't all that useful unless you really are depleted!!

So I guess what I'm saying is that you should use your best judgement as to how depleted you really feel.

last night i was up all night with headaches-despite following my calorie and protein (and fats as well) to the "t"
still losin 1/2 a week or so