1. You’ll have to decide on your own if you want to do early filing or not, I can’t help you make that decision. Here’s the guidance that’s already available on the AOS process spreadsheet to help you decide on which option you are most comfortable with going with:
1a. You don't have to wait until the 1st day of the month that your CN becomes current before mailing out your AOS package. The package can be mailed 2 months in advance - as long as the CN falls under the numbers indicated on the Advance Notification section of the VB.
1b. Please Note: Some FOs are still denying petitions considered filed prior to the CN being current, regardless of what the Early Filing Memo says. So it's your call whether to file early based on the Memo or wait for your package to be received on the first day of the month for which your CN is current.
1c. If your FO denies your petition with or without an interview due to early filing, you have the option of filing again starting from the 1st day of the month for which your CN is current (assuming time is not a factor to contend with). You will however have to make a new payment, and may have to redo the medical exam.
2. Reach out to your CS to find out if there still open and if you can come in for for scheduled appointment or not, I can’t help with that.
3. The emailed receipt is as good as the one that comes in by mail. No need to contact KCC for a paper copy.