@oliof As you said there is a peak at very low frequencies, don´t know if enough high as to be a problem but there it is. Also I tested with and without a reinforcement in the X axis (I added a L shaped aluminum of 10x20mm all the wide axis lenght) and the peak around 40hz is now smaller but the VFA is more notorious in the printing, I will still try to dig some improvements at low speeds.
Here is the graph with the totally helpfull new Input shaping plugin:
Captura de pantalla 2022-04-07 12.02.26.png