Hmm... so you are saying the Flux DMCC light is 5 ounces heavier than a Flow bindings (1 lbs 15 oz vs 2 lbs ~4 oz). or about 141 grams. That's a noticeable difference, but not a huge difference.
To give things some perspective, that is weigh difference equivalent to
or 25 quarters (5.67 grams per quarter)
or 3 shot glasses of water (~42 mL)
or 1 snowball's worth of snow stuck on your board (~130 grams)
I think it's the other way around. Flux is lighter then Flow.
And try a 540 with a snowball stuck on the tip of the board. Maybe you experience a crash to the ground. Or why not put marble as top cover of your board
-- Better to have tried and failed and not tried at all --