We knew from the tests in Bahrain that the McLarens were quite a bit faster than us," Marko told Viaplay. "We reduced this advantage, I would say, from half a second to two or three tenths. We can follow them for six to eight laps, but then our tyre degradation comes earlier.
3-5 races in theory (with maximum coping). Damage control until then?[the tyre wear is] the main problem, with some other problems as well. But we know what the problems are now, and [the engineers] are working hard. In three to five races hopefully we can cure it, so that we have a car on the same level as the McLaren."
Sounds like they want to specifically remedy the tyre wear issue. Not just "add downforce" which also needs to happen of course