Good morning everyone, I'm having some trouble with my Class 26.  I'm usually running 138 or 207 top and bottom through 8-16 ounces of firm veg tan.  I use a 23 needle for 138 and a 25 for the 207.  I'm getting inconsistent stitch tension and the occasional balled up knot/loose stitch that isn't pulled up through the piece.  This is especially true going around any type of corner but as you can see in the pictures it happens in the straights a lot too.  The pictures below are 207 through 8