If you have to press hard with your rotary cutter CHANGE THE BLADE!
Yes!
I have never understood using a skipping or worn blade. I hear someone say but it's still new, I changed it not long ago. I change blades at first skip. I have quiet a few cutters so I reach for another one and put the one with the bad blade in a basket to change later. Blades and machine needles are the most inexpensive items I buy for quilting.