I guess being lower to the ground could work, but I don't know whether the angle would still be correct?
I've done the 2nd to the left method before. I found that after a certain point I began pretty violently spasming, which pushed me off the ground and relieved the pressure. I also bashed my head against the door I was using and I think the mild concussion made me pissed off with it so I gave up. I've also done full suspension but that didn't work because I didn't have the correct equipment for it.