If you have the money(And I mean a lot of them, not only enough to buy parts), sure, why not. What I don´t get is people buying lightweight compononts that actually make their riding worse(superlight tires, carbon forks, bars etc).
Can I adjust the chain tension on spring tensioners? Any better tensionin solution for a 2013 w/ 22/16?
Yes you can, but it´s hard to do with the chain in place. Take the chain of the freewheel so it´s loose, set the tension, put the chain back on. Problem sorted.
Those 2mm are just enough, if you look at hollowtech 2 cups even they would accomodate 30mm axle and they weren´t really meant to. From pics you can see those cups are very slim , it looks like there is even 1mm of unused space at each side. They wouldn´t say it works if it didn´t.