Just so you don't think you were doing the yo increases wrong, they're supposed to leave holes--eyelets basically.
When I do M1, I pick up the bar with the left needle from front to back and knit into the small loop at the back. This doesn't leave a hole. If you knit into the long strand of a M1 it will leave a hole. Are you sure you did the M1's correctly and knit into the small side?
:thinking: To be honest the M1's are the most invisible I can think of. You can try a kfb, but it might leave tiny holes, too.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry