i will add backing plate to stern
cleats.
They are already positioned properly in
deck to
hull bond,
fiberglass only, and fittings substantial. They will not pull out but thru
fiberglass, in real extreme force, i expect.
I will not have JDS but lighter version of that using 20mm nylon
rope and add/remove weights/wraps as per conditions. Will use starboard
winch to adjust length - active storm tactics.
I would not use balsa sandwich as not strong enough & you risk
water intrusion and subsequent
rot and further degradation of strength.