Did not understand, what you mean in question 1..
Use Nova launcher. Probably this'll solve your rest 2 problems. Beautiful google search bar and you can set custom gesture to do many things. Try that.
I think 900F model not present in us. 900T is for T-Mobile. 900V for Verizona etc.
900H version is Exynos version. But all others are qualcom version..
I've counted my every steps and I found it's similar to my S5..
May be something going wrong with your S5 or Jawbone up band.
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