Hi LuluMama8 - I wanted to give you some feedback, though the "suck to sleep" association hasn't really been our issue, so I hope that someone else will respond to you as well!
1. PPO not working/feels the same as removing nipple once she is asleep. I totally hear you on this one, but I think if you persevere, you will eventually get results. How long? Probably varies a lot by kiddo. I still have times when I have to do PPO 7-10 times in a row, but the majority of the time my LO will pop off when she is full, roll away, and fall asleep. I think it is important to be persistent, that is, don't wait too long between attempts. Don't give her the chance to fall completely asleep, keep giving her the opportunity to fall asleep without the nipple in her mouth. Hang in there!! It is so worth it to see your baby's back!
2. What do you do right after PPO? We worked diligently on the first step of NCSS's 3 step approach to getting the baby to fall asleep out of arms. We haven't really progressed much past step 1, but I think it is because I am so satisfied.

For me, when PPO works, my LO comes of the breast, sighs, rolls a bit (unless in my arms), and is asleep. I then transfer her to the crib (or bed) right away. When she stirs, I shhh/pat butt to sleep. It works amazingly! Now, if after PPO she opened her eyes, or otherwise indicated she wasn't asleep yet, I would pop the breast right back in there and never allow her to become completely awake. If the breast isn't working, then I would bounce to sleep or whatever would work. I know, there is nothing more frustrating than having your LO asleep and then "ruining it" and having to spend an additional 30 minutes getting back to that place.
3. Getting to sleep without nursing? For the first 4 months of my LO's life she would NOT nurse to sleep. I usually bounced her to sleep in my arms after nursing, it is pretty much like wearing her to sleep, except it is much easier to transfer her to a bed - or just sit down and read a book if the transfer isn't going to happen. It worked, but I don't really recommend it, because as baby gets bigger, bedtime gets harder. Right now what I am doing (sort of a spin off of the latter steps in the NCSS 3 step plan mentioned above) is laying down in bed with LO, nursing until almost asleep, and then laying there and soothing, re-offering the breast, etc until she falls asleep next to me. The first week it took an hour every night... there were some tears, but not many, and I was always there, and always re-offering the breast. The second week the time starting coming down and last night it only took 15 minutes!!! She nursed until content, popped off, rolled back and forth for a couple of minutes and then closed her eyes.. AMAZING!!! That night.. she only woke 2 times. Even more amazing.
Hope any of that can be helpful to you!!