We have changed serveral websites to https. All users will be redirected via 301, all urls on our site was changed to https, too. First problem is, that Matomo's visitor log still shows "http" urls, which cant be possible, because the users will be redirected.

It seems this problem is an old one, someone posted it on the forum, too:
https://forum.matomo.org/t/tracking-von-https-in-url-wird-nur-http-angezeigt/22990 (german post)

The second problem is, that we are currently not 100% sure, when we use the "URLs" configuration for websites, that "https" will be also consididerd like the "non-www"/"www", when we have just used "http://www.example.org". There are some missing informations about this. This need to be clarified more.