Try this
Hi Stacy, if you haven't already given up on Pilates, please give this a try (it's from a Pilates instructor).
Lie on your back, with abs drawn toward the spine. Place your hand at the base of your rib cage where the 2 sides come together & give a little cough. Hold the position where the act of coughing pulls your ribs in (your abs actually are pulling the rib cage together). You should actually be able to feel it with your hand. This is the position your abs should be in when you're exhaling during Pilates movements. I'm working on maintaining this contraction during exhales & inhales, but start with the exhale.
1) Try a straight-leg roll-up. Your abs should stay in the contracted position during the exhale. All movement is in your torso with your head & arms just going along for the ride.
2) Try the saw. Again all movement should be from the torso. Body weight should be equally distributed on both buttocks as you "saw" off your little toe with no leg movement. The trick is to keep weight equally distributed on both cheeks throughout the movement. The abs are contracted during the exhale.
If you're executing these basic movements with perfect form then maybe Pilates has nothing to offer you. Stott's advanced tape is supposed to be quite a challenge so it's surprising that you don't find it so. The equivilent would be a novice weight lifter going through MIS with the same weight as Cathe & finding it easy.
Again, I'm not trying to push you. I've gotten so much from Pilates that I'm puzzled by your experience.
Debra