I agree with the "more difficult to find" change because that would allow newcomers to mine more coins using PoB and PoW.
I also think that we might want to decrease nTargetSpacingWorkMax (the max PoW target time, currently at 15 minutes).
(Disclosure: I'd benefit from that, too

)
I don't understand what exactly you mean with "reward increase". Do you want to increase the annual PoS inflation to 10% or do you simply want to compensate for the higher difficulty? (the latter is certainly OK, not sure about the former)