Giugliano finished 17th in race one, during which he had to stop in the pitlane and get his rear tyre changed, before bouncing back to claim fifth place in race two.
However, Giugliano was not the only rider to suffer from a lack of grip as World Superbike Championship leader Jonathan Rea complained of the same thing and said that "it was like riding on ice".
"I'm very disappointed with the race one result," Giugliano told reporters. "I was really struggling with the grip and so decided to come into the pitlane and get the rear tyre changed. Doing this meant I lost too much ground and there was no way to catch up once back on track, but at least we understood what the problem was.
"In race 2, I was hopeful that I'd be able to do better but from mid-race the grip dropped off and I was unable to ride as I wanted to."