Advice on a shallow swing mooring

If you reckon that you'll have a metre under the keel at LAT, I don't see any problem, unless the site is ridiculously exposed, in which case, I wouldn't want to be there anyway.
 
The last few days was neap tides when it comes to spring tides it will dry by how much will depend on tidal range
In your locality.
 
One metre over LAT. Add a bit of high pressure, you're down to, say, 70cm. You're probably OK up to 1m swell with a bit of margin, which doesn't feel like much to me. Personally, I wouldn't sleep well when the wind gets up.
 
When I was on the Exe, sand and mud, I always felt that 2m under the keel at LWS was my limit. While a bilge keel is designed to sit on the bottom the idea of it banging about for an hour or so each day did not appeal.
I was also on the Exe off Starcross for 12 years. The seabed was mud at my mooring. On a couple of the lowest tides of the year I would touch bottom with my encapsulated keel but with so many exposed sand banks around there was no fetch and no waves. I was never worried about low tides but the Exe is quite open and gets very lumpy at high tide in a gale.
It all depends on how exposed the mooring is so local knowledge is best.
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