After some more testing…This might solve the problem:
I tried four different 2A power supplies so i thought that’s not the reason. BUT after i tried one more. Suddenly i don’t have problems any more. My connection is much more stable in every way.
After i knew it might be the powersupply. I solderd a 1000uF capacitor to the output of the old one which is a 12V to 5V converter (The repeater gets power from a solar system). And yeahaa. Live feels better with stable internet 
(I am a hobbyist. So if that capacitor is a bad idea. Let me know)
Change of power supply/ Capacitor seemed to have fixed it. For now 
The final setup (which was not the test setup earlier) runs now since three days without big problems: The GL-MT300N in combination with a USB WiFi (TL-WN722N) and a helical-dish antenna repeats the wifi to my house from an access point 1km away. I get an average signal of -61 dBm. (Only a small bush in between)
These are my ping-times now in my final setup (last 6 hours). Ping tests are running from a Raspberry Zero W which connects to the GL-MT300N via wifi:
I am happy with it. Big improvement to how it was before. The spikes appear when people use the internet. But it’s not really an issue.
Will keep observing but i hope the power supply was the issue.
Using a cable between mini router and main router. Then I get super fast speeds and the ping between the router and the device is around 10ms without any big hiccups (I still believe it should be 3ms or less). But i am happy with 10.
Never set up mac clone.
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