Ultimaker 2 Extended+ is printing bad support material

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Hello everyone,

I am facing a problem with my Ultimaker 2 Extended+ printer.

The support material is not being printed in a nice way. I am sending a picture showing my problem.

I saw that the nozzle was hitting the support, and I activate the Z Hop When Retracted, Z Hop only over Printed Parts and Z Hop Height = 0.5 mm. However, the printer is still hitting the support material.

Before that, I tried to use only Z Hop When Rectracted and Z Hop Height = 1.0 mm. However, I was having under extrusion problems soon after the Z Hop thing. So, I modified these options to the option mentioned before.

This was the under extrusion problem I had when I used Z Hop for everything:

So, does anyone know how I can avoid bad support material and under extrusion in my prints?