Tengu,
Sounds like you have been getting good advice on how to use the new PM, aka "Conversation" system. Can't add much to that.
As for your "details in public", not sure what details you mean, since you are showing stuff in different places, and for different reasons.
Date of birth, which you are showing, can be toggled on or off through the Personal Details page.
- Hover your mouse over your User Name at top right.
- Drop down menu appears
- Left click "Personal Details"
- New screen, half way down you set your d.o.b and whether you want it visible or not.
You seem to have had trouble in the past with managing storage space in your PM Inbox, this resulted in your Inbox becoming full to capacity and people that wanted to reach you had to use the Profile Post function. You then replied to them as if you were using PMs. Therefore you have your (possible now out of date) postal address showing in your Profile Page. That should be simple enough for you to delete yourself, each post appears to me to have that option. However, if that is only a Mod tool, I will remove the posts showing your address, and you can clean up the rest asking whether you have received a PM from someone, or asking you to clean up your inbox
Not sure what other details you have seen. If there are more, just let us know and we will do what we can.
Chris