If you're due early September, that makes you 34/35 weeks? I think this may be too early for baby to turn. Are you having any strong BH ctx?
I'd stop taking the pulsatilla unless you get a series of strong, regular braxton hicks- when it would definitely be indicated. I'd do lots of visualisation, lots of positioning (as ever, try the Spinning Babies site) and as you said, water- not just handstands, plain swimming will ease the gravity as well. If you can keep baby out of your pelvis, s/he has more room to turn.
For me, the pulsatilla worked well but it was definitely indicated (it's pretty much my constitutional remedy, and also my eldest child's constitutional remedy- it works for me for PMT and on his teething as well) which makes me wonder if it's the wrong remedy for you. Possibly, it could be worth consulting a homoeopath. I'd try accupuncture, and take it from there.
Don't panic- it's still very early, and you have LOTS of time.