Full flattening of the reward curve is an extreme economic change that I'm for and believe most of the community is ready for.
BUT, I think the flattening should be enforced gradually over at least 6 month to mitigate unintended consequence in user behaviors to this change.
400% boost of the voting power is too drastic an economic change especially when combined with the flattening. I've once written about that subject at length (got lost on slack) and agreed this parameter was too high BUT As new Steem frontends and completely different use-cases develop the mechanism to make this change should be periodic and new delta % change found though witness voting process and not as a HF. (more on that in another post)
I thus recommend voting power change to be lowered to 2x max or postponed for when we have evaluated the usage pattern brought by a flat curve and a more functional UI on steemit.com. One that does not encourage groupthink though a prominent trending page but give comprehensive access to less popular content.