Hi Kevin,
I do own both the Carpenter SP78UHL and the PD Black Diamond.
They both have the same lifting capacity as each other (the Black Diamond is marginally more powerful) and I run PE 10 GT Avani on both.
As far as a realistic HEAVY popping rod is concerned, I chose the Black Diamond due to its ability to sling a 200gm popper 90m and work it well.
It also isn't a spine popping experience to hang on to as well, where the Fire Vortex is!!
Basically, I am 5'10 and weigh 93kg.
If you are under 6'4 and 100kg forget the Fire Vortex!!!!!Also the Butt section on the 80 Extreme, Diamond, Black Diamond, Black Mafia & Fire Vortex is the same in rear & front grip length.
Cheers
Aaron AKA Donkey