I'm in - balance
First - sailingdog, donradcliff, something Anna - all said wrote cool stuff.
I can't remember exactly what the book says (Hvy WX Sailing), never saw the vid.
To me me "heaving to" means this:
ballancing a boat. Storm tactic, ya - if you can ballance it. Every boat and sail configuation is different. Of course, wind spd and seas come into it.
If ya want to learn more about "heavin to" (on your ride)- give it a try.
It's about ballancing a particular boat, and a particular situation.
It'll be a totally different deal if you need to "heave to" to save your arse.
Wx is a thing.