I personally believe a ramp holds lifters back, Yoda. I've watched a lot try to make gains that way but it almost never works.
My standing reps came after about 18 months of working up to a couple sets of 50. One on Monday, the other on Friday. Even that was pretty easy, taxing, but still easy. Too many sessions per week were the killer for me. Finally I told my lifting partner to back away and cover his face, I was going to try one standing. When you stand at the top of your first attempt to see how bad it'll be, I assumed guts would splatter our weight room.
Lo and behold, I was able to control myself to within about 8" of the floor before I collapsed, keeping most of my guts inside.
The lightbulb popped on and I started doing just one negative after my regular set. Then came the day I could finally control myself to the floor. After that, I added a second and third, continuing for a few more months.
Then one day I was feeling a bit frisky and told Baby Bear to look out, blood'n'guts were going to drip from the ceiling and walls. I was going to use momentum and bounce hard enough from the floor to get a bit of rebound. I was determined! An odd thing happened, knowing I was committed, I actually controlled myself to the floor and made the turnaround, coming back up. Well, hell, if I can do one, I can always add another later! Sure enough, over the months, going slow and easy, I made it up to 15 standing, without a break, on Monday.
Fridays I did something different and played with decline(?) ab wheels. I brought a 2"x12"x8' board in and set one end up on two 45 lb rubber bumper plates, making it about 8" off the ground. Yeah, it doesn't sound like much, but standing on it with a wheel in my hand, it looked like straight frickin' down! Eventually I would use Fridays for only 5 on the decline and anywhere from 6 to 15 on the flat wheel day.
Hope I've helped! Can't wait until I build back up again. Slow and smart wins the race.