I think the 45/25/30 are percent ratios of the diet, not the amount in grams.
Those ratios are great for offseason, usually people manipulate one macronutrient, so the lower their fat or carbs, do carb tapering, so drop starchy carbs at night, or carb cycling.
You don't want rapid WEIGHT loss.
1 lb of muscle is only 600 kcals, so if you are losing weight quickly, and a lot of it, unless you were quite big to begin with or on a low carb/keto diet, you are probably losing muscle.
Remember 1 lb fat is 3500 kcals, so a 500 kcal deficit/day.
You could lose almost 1 lb of muscle in one day if you are too calorie restricted and training intensely.
Losing muscle is a SIN
I am of the mind that there is no point in messing up your metabolism for ONE competition, you want to be doing it over and over and over again (if you like it and get the bug).
You also want to be able to return to a normal bodyfat without the rebound or issues with a slower, damaged metabolism and have to go through the hassle of fixing it.
Far too many people diet incorrectly IMHO, too severe a calorie restriction which does have an impact on the physical and psychological.
Take a peek at the Minnesota Starvation Study I have posted in this section.