I haven't requested a withdrawal yet. I sent an email to BC PNP about the change in employment (I'm on temporary unpaid leave now) 2.5 weeks ago and created a post-nomination support on their website. I'm waiting for BC PNP to respond to my email. If their response indicates my PR application might be rejected 5 months down the line, I will request a withdraw and apply through CEC.Have you been able to withdraw your application? For PNP, you can send an email requesting for a withdrawal. For CEC or FSW you need to send a withdrawal request using web form and also attach a written signed consent with reason for withdrawal.
Hopefully they respond soon (they said they do in 5 business days...)