"Our Mercedes is a very sensitive car," Finn Bottas admitted to Italy's La Gazzetta dello Sport.
"But if we find the right setup it is really fast -- the difficulty is just finding that setup.
"Ferrari is really strong and has been better than us in managing the tyres, but we are improving as we saw in Montreal," Bottas added.
As for his personal performance in 2017, and amid speculation Mercedes may extend his current contract into 2018, Bottas confirmed he has settled in well.
"I will try to fight with Lewis at every track, and trying to beat him is a great motivation, but he's not an easy teammate," he said.
"Next there is Baku which I think will suit me. My goal is always to win races and one day the title, but it's really important for me to be consistent for the team," Bottas added.
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