Glad to hear you're getting the grip on OCS.
It is not as "user friendly" as OJS in some aspects, as it has a lot more controls and options, due to the much more complex nature of a Conference.
I had the same issues when working on a conference here and it is very important
to pay close attention and do full tests of OCS's features before actually going live. Changing configurations on-the-fly may cause submissions to "disappear" or publish what you don't wish.
Also, I'm not sure if it has been fixed yet (memory is leaking), but you may want to check and test the registration process.
The registration closed on the day it was defined as the last day, instead of including that day. I had over 10 registration options and changing every single one of them to add one more day was a "really boring" task. The date displayed was confusing, as we had to add the real date to the description, while OCS displayed the "final" (+1day) date.
Other things you may need is to generate registration reports, attendance lists, participants lists for identification tags and certificate production and mailing.
I created a test plugin
that's not even an official/alpha release, but it seems to get the job done, at least exporting part of the necessary data for those external documents.