How do you tightly pull a slipped st? Or is that not quite what you meant...? I find the edge sts are messier and looser when I slip them, they're better if the last stitch is slipped. But what works best for me is to just knit or purl the edge sts, then pull a little (not too tight) and work the next coupld sts just a wee bit tighter and the edges come out neat and even. Pulling too tight can actually make things worse sometimes.