Logos are a challenge. I have to decide when I quilt over them , where I will quilt or IF I will quilt over it. I avoid the plastic-y logos like the PLAGUE. If I HAVE to go over them, I make sure I have a big enough needle, I go slow, I quilt as little as possible...and I PRAY! you didnt' say what kind of thread you are using? That might be part of the issue too. ( you also have to ignore the hole the needle makes...that plastic ink is not fun.) The last tshirt quilt I did...I did the biggest meader I could and get it quilted. You want the tshirts to be the stars anyway.