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Valtteri Bottas believes the upgrades delivered to the team's FW38 have not had the desired impact, leading the team to be outrun by its rivals on the development front.
Following two competitive seasons we saw it finish third each time in the constructors championship, Williams was viewed along with Ferrari as the most likely team to perhaps tackled Mercedes dominance.
Results have not lived up to the team and Bottas' expectations however, with Williams well outpaced by Ferrari and Red Bull while Force India is snapping at its heels.
"We have not been 100% satisfied with the development in terms of improvements and upgrades for us as a team," Bottas told Autosport.
"Some of the other teams have outdeveloped us a little bit, which has now put us under pressure from Force India. But this is Formula 1, it's competitive and it's tricky to be running up front.
"The main thing in the second half of the season is we start maximising 100% from the car, which maybe some races we have been struggling to do."
Williams still have a few minor upgrades in the pipeline, scheduled to be introduced between Spa and Singapore, but the Grove-based outfit will indeed be seeking to extract all it can from the FW38's current potential as it has now devoted all its resources to its 2017 car.
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