Nope.If you think about it, it´s only logical.
The Yumi is one of the "big 3" of the bows, namely the Long bow, Rus bow and the Yumi.Those are the "bigger" bows requiring 6 pd, with more damage and Accuracy.The thing that is supposed to make it unique and give it a niche right now is that it only needs 1 slot, contrary to the 2 of the other big bows.
This failed.Why?Simply because for a foot archer, if you aren´t going for style as a weaboo, one of the 2 other bows is almost always a better choice.For horse archers it fails because you need 6 pd, rendering you unable to get 4 Horse archery on level 30.
So, to make the Yumi a proper Horse archer bow, give it req pd5 and make it 2 slot.That way, it will be usable for the typical horse archer build.