Are you looking for more classic styled or newer bands that are like this?
If I was taking a wild guess Id say go with
Ted Nugent (if you havent already)
Foghat
some older Alice in Chains
Jethro Tull (kinda meh on the hard rock part)
Thin Lizzy
Thats all I can think of off the top of my head, sorry if you already have them all.
When I saw hard rock I was getting ready to list my favorite death metal bands Behemoth, VADER, Nile, Edge of Sanity (when they still had Dan Swano),... eh the list goes on.
A really good heavy band (but not death) is Nevermore.
They have one of my absolute favorite guitarists (Jeff Loomis) and they do make really good music however they're not the genre you're looking for, they're more of a Really really really heavy depressing power metal band.