My tank is the 48x24x16 80 gallon Deep Blue just like yours. I encountered the "spot light hell" when doing my first aquascape. I ended up putting all the wood, anubias, and ferns in the hot spot, and we all know how well that works.
So far I can't say for sure I've encountered the hot spot burn thing. It's probably because the lights are up so high. I've been seriously considering getting the 120 degree TIR lenses to get some better spread even though they come at a PAR loss. Running at 50% now that's just a big pile of LOL.
The second design is a bit more open with a lot more room for stems in the higher PAR spots. Right now I've got the Radions approx 24" from the water's surface and set to 50% on a 6 hr photoperiod. I only redid the tank a week ago so I can't say much at the moment, but things seem to be doing a lot better. I really should get the PAR meter out but I'm too lazy.