These are both rather unbalanced 2ply yarns and for good reason. I'm learning plenty about what I do and do not like to spin these days. Both of these fibers are from Spunky Eclectic. I love her stuff. The one on the top is s silk/merino blend in Tahiti, plyed with a tiny silk single. This skein is really light and airy and was easy to spin.
Then came the merino/Tencel in Pink Elephant. It was so slick it was pretty hard to manage. It just wanted to pull as much fiber in as possible and not "hold" the twist. So, I let it do it's thing and then I plied it with a thread of iridescent Mylar. It looks way better than you can tell. I have another 2 oz of this to spin so I'd best get anther spool of thread. If I had plied it against itself, it would have been so heavy. That's what happened when I tried to do that with Optim. So, now I'm seeing that if I want to get this weight of yarn and not laceweight, I should just ply it with a tiny single for strength.