wrong. x11 and X13 not bringing temp around scrypt level. it is 30% less temp.
Nist5 is not optimised yet, so for some people works for some doesn't works like it should.
And double hashrate doesn't mean anything 'cos value of the coin will be less by double.
you are not using the right miners for sure ..
But Asic are a specialized HW that not everybody has or want to purchase.
GPU mining is more democratic and orizontal scheme of distribution of coin's mining. It is still profitable for little and medium miners.
I'm just saying they consume less, its up to you which one you'll use.