Conditions as Lovie that day were pretty much hero. So no, you would not notice the benefits of a metal board. Yes, the Hangl adds significant weight to the board; only the competent racers really "need" a plate system such a the Hangl.
Did you join us two Springs ago at Winter Park when Bola did the informal demo? The melt-freeze conditions were brutal in the AM and death cookies were everywhere. Most of us were having trouble setting an edge. Inkaholic was riding the same board, 185cm SG with Hangl. I wish we had video because the board was vibrating like crazy as it went over the uneven, firm terrain. When you looked up as Ink's knees, nothing - no movement. None of the vibration was transferring through the plate system to him. That means that he was not having to counter or absorb the vibration input - the translation... he was using significantly less energy than the rest of us. I rode a Vampire later in the day and noticed a substantial difference - improvement over a standard construction board. As Ink mentioned previously, he liked the riding characteristics of the board so much he now has one.
Yes, the SG has an 18m SCR and you were able to decamber the board and make it turn super small radius turns. Yet the board had superb torsional rigidity. THIS IS ONE BIG BENEFIT OF METAL BOARDS, YOU COULD NOT HAVE DONE THAT ON A STANDARD CONSTRUCTION BOARD! So, yes, you did experience one big benefit of a metal board. Metal is extremely versatile; that is part of the reason that everyone callsthem quiver killers.
Talk to Bola, take a metal board to Lovie on a Sunday here in the early season. They are not grooming on Sundays yet; the condition will be firm and uneven. This would be the perfect time to demo a metal board so that you will understand the benefits!