Old guy comment...
If your rifle already shoots, as you say, "like a dream," then don't mess with it; just my opinion, nothing more. Play with it after hunting season to see if you'd rather use the ghost ring option. Practice will tell you what you need to know, and what and how your hunting situation allows (tree stand, blind, heavy brush, max range, etc.). It's pretty amazing how your shooting eye will automatically, and naturally, center through that rear aperture using either the peep or the ghost ring when aiming.
I have a really nice Redfield Olympic aperture sight on my old M1917 '06. It's got a great hunting aperture on it, but I can unscrew it (taking it out completely), which really opens up the receiver ap. It would (IMO) be very much like a ghost ring, and I'm sure it might be an aid in a close running shot, but personally, I don't take those anymore; just don't need to these days. The ramped front sight has a small, brass, vertical rectangle inset on the top of the blade, which works very well for my near 68 year old eyes. I've just never found in my shooting that rifle with those sights that I need to "ghost" the rear ap, but that's just me.
I would think that sitting in a blind or a treestand, and knowing my shot wouldn't be much over 50 yards, the ghost ring option might be a good way to go especially in early morning or late evening (legal hours, of course) hunting/shooting times. Again, especially with my older eyes, a more spacious ap would probably be a good thing. I've even considered purchasing one of these, the #4 hunting disc:
www.meritcorporation.com/products.html