Works fine without disabeling cloudflare for me
Cloudflare conf:
SSL: Full (strict) ! <---- that's the key maybe?
A: @ to IP
CNAME: www to
DigitalOcean 512mb VPS. Full install steps:
apt-get update && apt-get upgrade
wget -qO ee rt.cx/ee && sudo bash ee
ee site create mysite.com --wpfc --letsencrypt --php7
and voila - https://mysite.com works fine.
Only problem is, that :22222 does not work 
PS. Should I also be worried about my site not working in 3 months?