dear guruik,
Try to understand this, its not about getting a PT or not or its not about how successful can u be after proceeding with PT,
despite high ielts score as yours if u end up with 446 u have no other option apart from going for PNP be it ensured or not .........if low ielts was the cause for your low crs( which is actually not true) then u could reappear for ielts like how i did or like how other person Mr. Russian did as he mentioned.....but thats when u were to choose between IELTS/PT but now u have no choice on ielts so u ought to go for PT what ever may be the reality or speculation around u being successful after getting a PT.
what ever u do, dont waste time....earlier the better.
Thanking you.
yours sincerely,
Rrk.