  A coupled-channel S- and P-wave next-to-leading order chiral-unitary approach
for strangeness $S=-1$ meson-baryon scattering is extended to include the new
data from the KLOE and AMADEUS experiments as well as the $\Lambda\pi$ mass
distribution of the $\Sigma(1385)$. The positions of the poles on the second
Riemann sheet corresponding to the $\Sigma(1385)$ pole and the $\Lambda(1380)$
and $\Lambda(1405)$ poles as well as the couplings of these states to various
channels are calculated. We find that the resonance positions and branching
ratios are on average determined with about 20\% higher precision when
including the KLOE and AMADEUS data. Additionally, for the first time, the
correlations between the parameters of the poles are investigated and shown to
be relevant. We also find that the $\Sigma(1385)$ has negligible influence on
the properties of the $\Lambda$ states given the available data. Still, we
identify isospin-1 cusp structures in the present solution in light of new
measurements of $\pi^\pm\Lambda$ line-shapes by the Belle collaboration.
