I'm using The HDRI mainly to have something to reflect, but it also creates a bit of variation in the lighting.
My lighting is made out of 1 area light, 4 spot lights and the HDRI currently. I set it up using '7' on the keyboard (forgot how this mode is called :headbang: ). I'll try improving this though after I'm done with the current render.

I did some testing with reflection and refraction limits and lowered the refractions limit to half of the previous amount. also increased the refraction rays a bit and lowered anti aliasing samples (I don't know why it didn't work the first time...).
I let it render just about the same scene it rendered yesterday in 2h 8m. I just want to see how long it'll take now.
Thanks again for the help,
Benny