where did you get the idea that you aren't supposed to cycle your calories and carbs?
every athlete in the world does that already so it isn't anything new and you SHOULD be doing it. it is just that those carbs should be CLEAN foods. i'm not saying go out and eat bread and pizza. good carbs like plain rice, sweet potato, fruit, raw honey, etc
also you don't have to just increase your food on workout days like you are a robot.. some days you eat more, some you eat less. crazy that every animal on earth eats like that except the ones in cages, yet people want to treat their nutrition like they are caged animals or robots trying to outsmart nature