At this point the Ph does not matter AT ALL! Duh, they are suffocating.
. LOL Do not Ph your water and up pot if possible. I have read that HP works as long as you don't have a micro culture that you are going to kill off(which you don't.) Being that I am just passing this info to you you may choose to do what you like.
My plants looked like yours 3 weeks ago so I just put them in hydro and they look like gold. Hydro might not be for you but, it will bring your plants back to life in days not weeks.
Ha look at my avatar... look familiar?
Peace