I started playing slayer two days ago. With the dual axes i also did really bad. Constantly got hit. Can’t really say why. I use other weapons with him now. Works good so far.
I also noticed that some weapons have strange behaviours, like the window to cancel youre attack is much smaller or other stuff.
In this thread Strange behaviour on some weapons i already call attention to some of them. if you want you can add youre weapon there.