Packages upgrade - qt & plasma conflicts

[mkolenda]

Once upon a time I upgrade packages in my system to the latest unblocked ones and every-one-time I end up with dependency blocks.
Usually I solve them by uninstalling packages which are blocking installation and everything that depends on them.
Lately i have decided to give a try to kde5/plasma desktop environment, written lots of entries to /etc/portage/package.accepted_keywords/kde-frameworks-5.19.keywords and ../kde-plasma-5.5.keywords

I have kde-plasma/plasma-desktop-5.5.5-r1 installed at the moment but i wish to upgrade to 5.6.5 or 5.7.1 which are marked as test packages for now.
Mostly because 5.5.5-r1 is extremely unstable on my configuration. I have 2 monitors at the moment with nvidia drivers and i suspend my system to ram.
Plasma is often crashing, my panels are disappearing, i have to create new ones and configure them as i wish them to be but then after restart i'm getting back my old ones or similar crap happens.

At the moment i have qtcore 5.5.1 installed, i don't really feel need to upgrade it at the moment but i definitely want newer plasma-desktop or i'm gonna remove this 'cause it's blocking me from work.

I tried to upgrade world. Here is the output: http://dpaste.com/05NQGSW

You see my case now. I would like you to tell me how would you solve this problem, convince me to try other desktop environment or something.
Just say something. I feel lonely.

At the worst scenario i'm going to spend two nights in black console with two blacked out screens removing everything connected with qt, kde, plasma and installing again.

[asturm]