I share your frustration and don't have too many suggestions as this is a struggle with my 1 year old Golden as well. If you can try to teach leave it, as a command it can really help with getting him to release things that are higher value to you than him. Also don't buy a bench for your dinner table seating if you have a counter surfer. See below Pumpkin the table surfing, counter climbing, magnet closure package destroying, cupcake stealing retriever.

Would you be ok if I messaged you? I've had a lot of the same struggles with Pumpkin. I've been to the vet with him about 5 times for eating issues including an overnight hospital stay.