I for one believe the distribution seems fair but maybe consider lowering bronze to 5% and increasing silver to 20% to be in line with gold since the difference in card and cp requirement is minimal, not considering staked sps since it is not a requirement yet.
The 30% in champion seems fair but with such few people there it seems less likely that it will yield what you think for now. That is that more people will push and shove to combine their cards in order to be a champion, or to rent a competitive daily focus champion deck.
Of course, Aggroed has mentioned that we will all see the data and analyze it to see where we stand and I am for that.