I think that sometimes PD works perfectly for some LOs and not at all for others. It didn't work for my DS at all and just wound him up. I tried for a month and it was just awful. A BW friend and I were going through the same thing at the time and both had pretty quick success by not laying our LOs back down. We'd both given that approach a fair old try (I had done it for a month) so we knew that it had time to click, and hadn't. Sometimes it can take a few days for things to click for little ones.
So. What we did. I made sure that my DS could lie down by himself from standing in his crib. We did lots of practice during awake time and in the cot. When he did stand initially, I would help him climb his hands down and get back down to lying. Patiently. Once I was sure he could do that, I stopped doing it for him. I sat near the cot (as part of a GW sleep training I was doing) and just repeated my key phrases of 'lie down, time to sleep'. I encouraged him by patting the mattress where his head should be or moving his lovie around. But I didn't lay him down - it was his choice. When he lay down, I praised (quietly) with good boy, time for sleeping. I kept myself close to the floor, so I knelt curled up on the floor so that my face was at mattress height - if he wanted to see me, reach me, he had to crouch right down.
Worked pretty quickly for us.
As Elmarie said, if you could post your EASY might be something there to tweak to ensure not OT or UT.