Mary,
I am a newbie, but hopefully this will help. I have found that I have to be VERY careful when I hoop the material NOT to stretch the material as I hoop it, (especially if it is knit, example, polo shirts). Sometimes sugestions given tell you to hoop and then grab the material and pull it to make sure it is tight, I find that this doesn't work for me, it always makes the outline not conform to the design. So, I carefully lay material on FIRM flat surface (NOT an ironing board), making sure the grain of the fabric is straight and hoop, then I tighten the screws as tight as I can hand tighten and sew out the design. Also, if I use an iron-on stablisher I am careful to just place the iron on top and "press", not sliding the iron around at all. I don't know if these suggestions will help, but I sure hope so, Good Luck & please let us know! Sincerely, Lollie in Oregon