Yeah, so the arm was moving with the new shaker design, but definitely too heavy. It needs 4 bars to just lift the arm.
During the event, I fried the electronic boards by switching the 5v and 12v, because both had the same connector. Next time, i am using XT60 for 12Volts and barrel jacks for 5V. There is also a component, which if it detects a higher voltage than rated, it cranks up its impedence. But it requires further investigation and would further complicate things.

This year, the electronic boards (esp8266 and esp32) were connected over openWRT router, to the raspberry pi, running mosquitto (MQTT Broker) so the code on the microcontrollers were fairly simple, and the fine tuning could be done more efficiently and easily. The EMP of the compressor does not seem to pose a problem.

Need waterproof electronics housing though.