Grosjean has failed to score points since the Monaco Grand Prix where he finished tenth with his only other point coming in Spain. The Frenchman has struggled for form with Haas this season sitting 17th in the Drivers' Championship and the team second bottom in the Constructors' equivalent.
Despite Grosjean reverting back to his Australia package, Kevin Magnussen is set to stick with his current one, allowing the team to compare data. Ahead of the British Grand Prix, Grosjean expressed his feelings about the situation.
"I was not entirely convinced when we first used the update in Barcelona," said Grosjean to Motorsport.com.
"But the data showed that it had to be good and so we started working on it.
"But since a few races, I know that I really felt better with the old package. That is mainly an emotional issue.
"Moreover, the last races have proved that we still need to learn a little more: at the start of the season the qualifications were very good but the race pace was not great I think we have learned from what happened in China and Bahrain and what we could have done better there."