So start at 2-3 low days at 40% of your TDEE... then have a ref fed day if high carb day at 15% above of your TDEE Maintenance TDEE...it's gonna take some getting housed to and listening to your body
Also, make sure you do the high day on Back or leg day! I know you've got TDEE trunks and don't work them as hard as needed(wish I had that problem

)
So your just depleting your glycogen stores on the lower days than filling back out on your high days - watch your weight a little to see how it's working but you know we can tell by the mirror too
I'd start at 40% if your TDEE and try 3 low days then 15-20% on your high days - BIB was just going keto on 3 days then gorging himself b/c he had no carbs to work with while working out but it works for him!
Your still getting carbs in just time then around your w/o that way you still have the energy to lift and the carbs as fuel it's all about timing doing this mate! Keep em coming guys