This is how it works out for me:
Please feel free to critique (Note that im in a calorie deficit all days except Sat and Sun and those carb ups are at maintnance calories)
What I like to do is move my heavy compound lifting days right after the carb ups. I use HIIT(at least 30 minutes its pretty intense cardio) cardio these days (Mon & Tues) And Ill incorporate some HIIT around Wed to glycogen deplete. Ill maintain LISS cardio the rest of the week (cardio everyday) I usually enter into a near keto state (its funny, i can usually taste it literally in my saliva) around Wednesday night. I intentionally lower my calories about 500 more (already in deficit at this point) cal a day by this point, until Saturday. It has been working well for me.
I do notice large flucuations in weight through the week. I have to mentally prepare for the flucuations I go through feeling fat and full to looking ripped and vascular. The net result so far has been great fat burning while actually making slow gains. Im sure I could lose weight faster but at the expense of muscle. Its been a learning experience. My goal is 9-10 percent BF and im close. I can good ab seperation when flexed, but Im wanting that look when relaxed and I want the belly button ridge.
I agree with skipping carb ups once in a while if your goal is purely fat oxidation but the carb ups help immensely with maintaining muscle mass. As im preparing for a beach vacation in about 4 weeks, im going to get pretty militant with my carb ups probably limiting my self to 1-2 carbup meals every 8-10 days like you suggest.
I notice when Im in ketosis and I lower my calories my weight drops fast, part of that is water weight, but I feel like a fat burning machine. Its not a state I like to stay in very long, but I see the benefit of it.