Step #1 Make sure the TT is level. Go buy a simple level at a hardware store if you don’t have one. This is extremely important.
Step #2 Check your stylus. I know it is a new cartridge and should be fine, but it is possible the stylus is damaged. You will need a strong magnifying glass to look at it to make sure it is intact and in alignment with the the cantilever.
Step #3 Check the vertical tracking force with an external gauge. Yes SME is quite good, but it is important to verify VTF independently, always. For your X40 it should be set to 2.0 grams.
I suggest you leave Antiskate off to start just to verify that everything is working. Then, set Antiskate IAW SME recommendation and see if that is the problem. If the same thing happens, cut it in half and see if that works better. Let us know.

