@scalz well, I'm only using the moteino as gateway with the script from moteino itself. I read a lot about antenna's (and know that it's advised to use the same antenna on receiver and transmitter) but to my surprise I got really good results by using a wire on the gateway and coils on the nodes.
I had also noted improved performance when using ATC in my old setup.
Now for my MySensors setup I am using coiled antenna's on both gateway (esp8266) and node (pro mini).
I could run some tests with wire antenna's on the gateway and node aswell. I'll try to post some pictures as well.
All my gateways are usb powered (through an adapter in an electrical outlet). My old setup (moteino gateway) had a serial connection to a Raspberry Pi. It seems unlikely but could the Esp8266 wifi transmissions (2.4ghz) cause interference with the rfm radio (433mhz)?