So, called an operator up again today. Instead of getting the usual reply of "it could be 20 business days", this operator suggested I actually re-send the documents since it's been 3 weeks. So, I just re-sent our I-864 and DS-260 packages by email.
The operator mentioned that our case was only changed to EP on February 17, yet we sent our documents before that. But if they process the emails in order, then technically, by the time they get to my email for the I-864, they'll have switched me to EP since I had sent the optin email three days earlier.
Two days before our optin was accepted, an operator actually suggested to me to re-send the optin email since they hadn't switched our case to EP yet.
I'm hoping the same thing happens now where they're just really behind on emails and they'll get to our February 4th email of our I-864 package soon. It wouldn't make sense to have to wait for optin acceptance to email things if they process emails in order.