All the on line articles advised that I needed to have at least six Y. Modesta (Red Tails) Loaches to have peaceful harmony. I searched all the LFS
in my area and only found four. That was a year ago, haven't found any more since. They turned out to be colorful, hyperactive, great scavengers, that don't bother any other fish. They behave just like your YO YO's. I happened upon a rare group of baby Berdmorei Tiger Loaches, (very expensive) Again all the available info said at least six. I bought 10. Within three weeks the dominant Tiger Loach killed all his siblings. You can't believe all info provided on line.
My point being; I think you have things under control. Its probably a good idea to increase the size of both groups of Loaches but no need to rush. Be sure to post pics.
Here are some pics of my Loaches.