  Within the framework of (2+1)-flavor QCD at finite temperature and chemical
potential, we present results using high statistics data and demonstrate how
the phasefactor of low order unbiased exponential resummation offers excellent
prediction, proving to be an alternative reliable estimator of the radius of
convergence of the eighth order QCD Taylor series at finite baryon density
measured using the ratio and the Merci-Roberts estimators. We construct a new
non-trivial unbiased phasefactor for complex isospin chemical potentials $\muI$
and highlight its novelty. We find that this new unbiased phasefactor is very
much capable of indicating the onset of non-monotonicity in finite $\muI$
thermodynamics, which we illustrate by comparing the phasefactor results with
that of low order cumulants of $\muI$ fluctuations for non-vanishing $\muI$. We
also furnish results establishing that this unbiased phasefactor is reliable in
manifesting the beginning of the overlap problem for finite, real $\muI$. The
errorbars increase drastically across the indications provided by the
phasefactor which becomes very apparent from the coincidence between the
phasefactor and the maximum of the errorbar slopes.
