Formula 1 turns its attention to Austria this weekend as part of a double-header with the British Grand Prix at Silverstone.
George secured a P2-finish last time out in Barcelona, while it was disappointment for Kimi who suffered a DNF after a reliability issue with his car.
For Toto, he is keenly aware of how tight the margins are in this sport and how quickly things can change.
"Barcelona acted as a benchmark for our current performance and, having won the first six races, offered a reality check," Toto said.
"Others have gained ground quickly and we need to respond. We are in a fight for both championships but must improve if we want to come out on top come the end of the season.
"Our Achilles heel so far has been reliability. We have lost a large amount of points across both cars in recent races; if we don’t put together clean weekends, our competitors will happily take advantage.
"We are not standing still in our efforts; we will bring a few updates to Austria this weekend with a focus on improving both performance and reliability.
"The margins are tight, and will be even tighter around Spielberg given the length of the lap.
"We need to put together a better weekend than we have in recent races but if we can deliver to our maximum, then we know we can challenge for victory."