How is the pip with primo ace?

Been considering it as part of my prep. But would hate to have to abandon it due to pip.

All primo ace has a bit of a bite to it or it ain't primo ace!!
The best thing is just to take the concentration down and mix it with sterile oil on a 1:1 ratio,so if your taking 1ml add 1ml of sterile oil.

What the best sterile oil? GSO (Grape seed oil)?