Personally, I find the cheaper bows to be more effective than the yumi.
Switched recently to the khergit/nomad/strong bows, significantly easier to counter foot ranged now.
Faster draw rate, faster shoot speed, similar damage
I find I'm able to get into the top 3 in the scoreboard far more easily now, compared to when I use my MW yumi (lvl 34 HA).
It just appears that the yumi is OP as there aren't many good HA's playing with the cheaper bows.
There are some really good strong bow HA users in Seljuks for example.
Personally, I'd like to see what I mentioned before, with a shoot speed nerf to the cheaper bows.
Maybe some tweaks to the yumi, like 2 slot or accuracy nerf.