Deltas are great
Endless Summer is a 1983 Hunter 31.  We use a 22 pound delta anchor with 40' of 3/8" chain and 200' of 3 strand nylon.  Our secondary anchor is a Fortress FX-16 witht he same type rode.In mud, we would use the Fortress as the primary and in the sand in Florida ond the Bahamas we use the delta.The delta has NEVER drug, and we have been at anchor in sore really discusting conditions.  Like 6-8 foot seas for 8 hours!  Don't want to do that again.  We have swung 360 degrees on the delta, during a short rain storm, and it stayed stuck.The fortress only drug once.  The bottom was a mix of sand and mud.  A small piece of packaging twine lodged between the flukes and the shank and prevented them from swinging to their max angle.  Of course it was 3am when a squall hit and popped it loose.  We put down the delta and it stuck immediately.When our dinghy is in the water we use a look bucket to make sure the anchor is buried.  If the water is not clear enough to see it, we pray.If the 1/2 inch line is too big for your boat, it won't stretch like it should, to absorb the shocks from bouncy waves.  This makes for a less comfortable time at anchot, and also could contribute to jerking on the anchor.The more chain the better.  Where we anchor it keeps the coral and rocks from chewing throught he nylon, but it also keeps the pull on the anchor more horizontal.We are sold on the use of an anchor sentinel.  Ever used one?  It also keeps the pull on the anchor more horizontal.I'd get a anchor chart from Delta and see what they recommend for your boat and then consider going one size up.Good luck getting and staying stuck!In sand you can't beat the delta!