Good idea to eat enough when coming off cycle.
There are different methodologies when it comes to post workout shakes. 75 is appropriate. If you were bulking you could up it and when you cut you can cut it down a little.
There are hundreds of diets, which will all work if done properly. The key is to have a caloric deficit and to eat quality carbs, so you don't have your insulin levels all over the place. It seems many on this board prefer to take their bodyweight and multiply by 10 to 12 to get their calories.
203 x 10 = 2030 cal. or 203 x 12 = 2436
You don't have to worry too much about losing muscle since you will be "on"
If you choose an isocaloric this would be around 170 g of carbs. Or 203 g if you use 12 cal per lb.
Or you could do a low carb/high protein/low far diet. And every few days have a high carb day.
It basically a personal choice.