Ditto! I also use the June Taylor shape cutter for multiple long cuts.

the idea of cutting more than one or two layers scares me to death. I have found that starching and ironing them together does make it easier.

I do it the same way, also using a 60mm sharp blade.

Sharp blade, pressed fabric with sizing or starch & firm even pressure while cutting on a good hand strength day. On a bad day, I get out my Alto's Quilt Cut 2. That is exactly what it is made for. I don't have much luck using yardage in it but fat quarters & scraps work perfectly.

it takes practice and some of my friends never could get it. Sharp blade and pressure on the ruler will help. Just cut what you are comfortable with and dont worry

I starch and iron the fabrics together before I cut-seems to keep the fabric together better-no slipping. And I use the larger cutter

I guess I have always been lucky. When cutting yardage I always go through 4 layers and never had a problem. It never occurred to me to do less because I always double fold my fabric for storage. Maybe it is because this is the way I have always cut?

The most I can stack is three and then I still have trouble. I usually don't stack more than two. It may take longer to cut but it's worth spending more time to be accurate.

I never cut more than 4 layers... if you want it accurate, stick to 2 layers.

it is also important to line up for your cuts on the same side of the lines. Are you using the lines on the cutting mat. If so this is not always accurate. Be sure and have some grippers on your ruler so it won't slip. cut a section and then holding the ruler securely inch worm your hands up so the cut won't slip. I find that the last 1/2" sometimes slips so do carefully. And regardless of what the pattern says - only cut what you can accurately manage.