I know we have to think back since there was a long lag in the orange to cyan move... But no longer are the rare drops being added to challenge. If we think back, the rarest drop was tiara. As we moved into blue we began getting more and more tiara from Challenger. Ditto with testosterone, muscle wax and headbanger.
The rare oranges are not being added to challenge so much of our time/stamina is wasted searching back on old boards and each level (c, c-1...) More and more of it is spent 5-10 levels below where we are in game play.
This issue is compounding, where each level we must spend more and more time "in the past" rather than in current game play.
Thanks for looking into this.