  Simulation data are analyzed for four 3D spin-$1/2$ Ising models: on the FCC
lattice, the BCC lattice, the SC lattice and the Diamond lattice. The
observables studied are the susceptibility, the reduced second moment
correlation length, and the normalized Binder cumulant. From measurements
covering the entire paramagnetic temperature regime the corrections to scaling
are estimated. We conclude that a correction term having an exponent which is
consistent within the statistics with the bootstrap value of the universal
subleading thermal confluent correction exponent, $\theta_{2} \sim 2.454(3)$,
is almost always present with a significant amplitude. In all four models, for
the normalized Binder cumulant the leading confluent correction term has zero
amplitude. This implies that the universal ratio of leading confluent
correction amplitudes $a_{\chi_{4}}/a_{\chi} = 2$ in the 3D Ising universality
class.
