Why twisted stitches? Why not just work regular knits and purls? I think twisted stitches have much better stitch definition and make the stitch pattern really pop out.
I am a loose knitter, and no matter how many needle sizes I go down, my rib always looks stretched out. I've tried everything I can think of: ridiculously small needles, twisting the knit stitches then untwisting them on the next row, etc and nothing seems to help. So I have mostly switched to working a twisted rib.
Twisting the knit stitches keeps them nice and crisp against the background of purls. Twisting the purl stitches doesn't seem to make it look much different, but if you are working flat, then knowing how to work a twisted purl stitch is necessary. All the twisted knit stitches on the right side of your work need to be twisted purl stitches on the wrong side.
Once you have mastered knitting and purling through the back loop, you are ready for a new challenge: working twisted stitches in a cable pattern. My upcoming design uses twisted stitches to create a zig-zag cable on a background of twisted rib.