F cup to a large A. I'm worried.

I am getting a breast reduction August 25. My doctor says I will go from a F cup to a large A. And bc of that I will need a FNG. I don't want one but ppl have said they've regained sensation and protrusion after. I am not really worried about size but I don't want to look disfigured afterwards, it's such a large reduction.
I have lost a lot of weight 313lbs to 220lbs and my breast are still at an F cup but not fatty. My insurance Health Partners says I have to remove 916g from each breast but I only have like 1000g ish but they are still huge so he's basically going to take out all of it. Idk how to ask my insurance if they can take out less bc I've called and the other person on the phone only reads me what's on the HP website and isn't an actual medical professional. If anyone has advise on that I'd be greatful.
My PS says bc it's such a large reduction I have to have a FNG but I've also read on this site that a FNG is an archaic procedure. Does anyone think I need a FnG? Any advice on FnG did you get feeling back?
At the consultation my doctor suggested only taking out 700g but he didn't put his recommendation in the letter for my approval so now I'm stuck with 916g but I'm hoping I can ask my insurance for less? Idk. I have a month until my surgery so we will see.

So I called my insurance and they expressed that if Dr. Witzkes team calls and explains that it would be medically detrimental to take so much out of my breast then the insurance should follow his advice i.e. I'm 23 and taking out so much breast tissue is like a mastectomy and I'd have to get a FNG and I wouldn't be able to breast feed or have feeling in my nipple. The person on the other side of the phone expressed that I shouldn't have to worry and that it should be taken care of. But who knows honestly. I have an appointment with dr. Witzke on August 1st so let's see. I set that appointment up before I called health partners for the 100th time to see if he would write another letter and put his recommendation in this time since I was already approved but the front desk said I'd need an appointment to ask to see if he'd be willing to write another letter.

I have a positive update! I was thinking I wasn't going to go through with the surgery since my SNUR score was high and would have taken me from an F to an A. Thankfully after talking to my insurance and my PS, Health Partners agreed to go with my Witzkes recommendation and instead of removing 961g he's only taking 550g and my insurance will still cover it. I knew if he'd put in his recommendation in the first place they would have agreed. He didn't even have to write a letter according to my insurance (even though they said they wrote a letter I know they didn't). So I won't have to get a FNG which witzke seemed a little too eager to do but now since it's like half of what my insurance was asking initially I shouldn't need it. So yay! Never give up and keep trying. I had to call my insurance so many times to get them to understand why taking out 961 grams was way too much and would cause me to need an fng. I'm also grateful that this is working out. I was very lost and sad but now I'm just nervous bc it's happening so soon!