Mercedes have already heavily revised their 2023 car amid their ongoing competitive struggles but have been left frustrated by the W14’s inconsistent performance fluctuations. While Mercedes believe their current car is “really fast” despite being yet to record a victory this season, team principal Wolff expressed confidence in its successor - the W15. “We will throw this one in the bin when it's really fast and then embark on a new journey,” Wolff is quoted as saying by Motorsport.com. “I think we have encouraging signs from the tunnel of a balanced car that's going to be more together, and we have answers to our…