I was in your boat too. I used to snore terribly. I lost a lot of weight, but I went through a body building phase in my younger days, so I’m left with a thick neck anyway, lol. Regardless if the tissue is muscle or fat, when you fall asleep all of the tissue in your neck relaxes and snoring occurs.
Losing weight may help a bit, but I would advise you to get your doctor to refer you to a sleep clinic immediately. It’s no big deal, you basically stay the night in a replica hotel room with sensors attached to your body. The technicians there monitor your sleep through the entire night and are able to pinpoint the exact cause of your snoring, whether it be sleep apnea or a more minor situation like poor pillow support.
They diagnosed me with sleep apnea and prescribed a CPAP machine to sleep with at night. Whenever I use it I no longer snore. It can be tricky getting used to it, but once you pinpoint the correct air pressure it works like a charm.
I don’t know what to tell you about going to tournaments though. My buddies have the same complaint about me, lol. I dunno about you, but I think I’d be too self conscious to bring my CPAP machine along. But on a hopeful final note, my wife tells me that I don’t snore nearly as badly as I did before on those nights when I don’t have the machine with us. I think it can condition your unconcious sleep habbits too.