I doubt there is a problem with the suit or a need to get a different seal although you might have a size / fit problem. I now have 12 dives on my Fusion Sport and had only two leaks. One was from the neck and I don’t know why although I might have had a fold in the seal or garment sticking out (it was a big leak). The other was a wrist seal leak and that one was totally user error.
Even though I had one neck seal leak for an unknown reason the suit has been perfectly dry otherwise through quite a few twists, head turns and other underwater acrobatics that usually elicit a leak. When the suit was new the neck seal was very tight, to the point I was concerned it might restrict blood flow. However it quickly stretched just enough to fit well (without trimming).
So give it a few dives to figure out if there really is a problem. Try not to look up, or turn your head without turning your torso also. If there is still a leak and if you bought it from a dealer then let them earn their commission by finding your problem. If you got it mail order then you can do a leak test with air yourself. Figuring out if your body size and shape is right for the suit will be more of a challenge. Note that if I went with the size charts White’s publishes, I am pretty sure the suit would have been too small for me (and leaked). My dealer proved to me that I needed the next larger size. While it inner suit seems too big at first it actually works well.