I used to have this problem too, so I made a resolution and stood up. I pulled the strap really tight to simulate sitting and over a couple weeks, gradually lowered the strap to the desired position. Kind of like building up speed with a metronome by slowly moving the tempo up notch by notch, but not.
You will find the benefits of standing to be many: Licking the neck, making weird and suggestive pelvic thrusts, playing behind your head (which I can't actually do), behind your back, and of course dancing all over the stage (which may happen to be your floor)