I only have luck keeping the models going straight with AG63 controllers and 2S LiIon from RX...

proportional works ok with mix in TX from elevator,
so when I land I push elevator forward and it slowly engages...

Stock JP controller and even small Xicoy with pulse effects caused model to abruptly roll to one side and hit ground with a wingtip...


Same as this guy:

https://youtu.be/CGVMrroOHMc