I also have Bernina's. I have learned to slow down at bulky sections and it goes over the seams much straighter. But, if you are not piecing too many seams like that, Stop, and use the hand wheel to advance over the seam and then continue sewing the rest of the way normally.
I also press my seams open when possible and I make sure I have a new sharp needle. The needle must be replaced often. Check your handbook to see how often they recommend. I am thinking after each project or after eight hours?
The machine has a walking foot or like someone said, use the even feed that you pull down from behind the machine and attach to the foot to give it a more even grip.
You can use the jeans helper tool if you have one in your attachment box. It is placed under the back of the foot to even out the foot so you can sew across bulky seams.
Last edited by RedGarnet222; 03-23-2022 at 11:21 AM.