From my understanding, the carbs are a hard maximum. You could eat 3000 calories at your macros, but your body won't necessarily use all 3000 as fuel. Similarly the point of low carb is to induce glucogenesis in the liver by depleting glycogen stores. Based off what I've read 30g net carbs is the maximum you will typically be able to have without kicking yourself out of ketosis, because its low enough to allow you to deplete the glycogen stores in your liver.
Which is pretty much the idea behind ketosis. With no glycogen your body will burn fat as fuel instead of burning the leftover carbs. It's basically cutting out the middle man in weight loss.
I hope that makes sense.
And just about any diet you try will have you losing a bunch of weight at first, your water stores will be depleted as the glycogen is used.
After that it slows down to a pound or two a week. It's a little disheartening, yeah, but progress is progress, and in 6 months you could be down another 25 to 50 pounds at that rate. Just stay the course and trust the process and keep tracking!