Hiya Phill,
West Cape Howe and Kalbarri are not meant to be taken seriously as deep water soloing destinations. Great places, just not what you are looking for.
Enjoy Blackwall Reach, it’s fun, but definitely not big. 12 metre max at low tide of easy climbing on the King Dick. Some of the other things you can do there are above rocks under shallow water, just be aware of it. Mostly people use it as a traverse, great fun or as a play area. You can work yourself really hard on the overhangs.
Cheers,
Toc.