Actually, since the day this thread was created, I have made a self adjustment to the situation.
I went to one of the plate's house couple of days before New Year's Eve, but I went there late in the night, about 1 am, thought I would smash once or twice, get half a sleep and then wake up and leave next day cause I had two work meetings, one in the morning, one at lunch time. I was physically so tired when I went there (had worked the day before quite intensively) that I had a hard time getting it up. To add to this, her periods came at around 2 am and all was a bit weird so we ended up sleeping, left in the morning. Then I did not see her for about two weeks and she started telling me how much she missed me and the sex and that I should tell her if I don't wanna see her anymore. I used a bit of diplomacy and told her that I am not going to have a lot of free time in the next couple of months and we can keep this casual if she would be OK with that. She said that we could take a small break without problem and that I could call her anytime and she would be happy to come at my place on request practically. She thanked me and said we had had a superb time together and she had lots of fun (a rare type of girl, usually they become bitter at this point LOL). So to round this up, one plate is "down" let's say, or is on "pay per view".
The other plate is also going to not be around much for the time being since she's quite young and she's having her school changed from during the day to afternoon school so she might come around a couple of times in the next months, but no biggie.
I am now in between two girls, one that I know since a couple of months with which I have a "special" connection with, she has written poetries about me and lately carved sth into wood for me as well, a nice, nice gift. However, I manage her very well now as she is one of these types of girls who has been used to be adored by guys all her life and she just cannot understand the fact someone else practically has the lead in his hands in this case.
I feel more calm, have more time for myself and I am casually striking up some new conversations with new girls.
I agree with
@deesade that if you feel stressed out, it is your gut telling you to take a little break and I did. Focusing on work and training right now, girls are not a problem with two of them present and two other practically on demand.