Very interesting video Surfdigger. Thanks for taking the time to put the videos together. Those conditions, with the large expanse of flat beach area are much different from what I'm used to here in S. CA. A deep seeking detector and a heavy duty sand scoop are a must in those conditions.
Many beaches here, but not all, have berms that clearly define the wet and dry sand. Conditions here can change from one tide to the next and hot spots can change quickly. I do a lot of walking to find those hot spots and then go mostly for the relatively shallow targets which are fast and easy to dig because they may not be there the next day. Thus I use a hand scoop and a detector with an eight inch coil which would have trouble finding a quarter at half the depth of the quarter found in your video.
I'm going to take a little time to reciprocate the favor by posting some pics of the conditions I'm used to hunting in. As a side note, I see very few people using bucket type scoops out here which makes me think they are mostly hunting the same way I do. The hot spots can vary. Sometimes they can be down low, sometimes they can be on just one side of a washed out area, sometimes they can be up high, Sometimes they won't be in a washed out area at all but between them in an area that you would have never expected. And often they are not there at all. You never know until you get out there. But a fresh cut is hard to beat and the competition knows that.
These pics were taken by my daughter who I dragged along to be the photographer. Enjoy.