In a previous study, we presented the fundamentals of deriving a forward model for calculating coherent x-ray scattering signals from solute-solvent systems, based on pairwise radial distributions (RDFs) sampled from molecular dynamics simulations . In the present work, we investigate how finite-size simulation cells introduce errors in the long-range behaviour of the sampled RDFs (finite-size artefacts), and what effects this has on the predicted scattering signal. We present a new method for eliminating these artefacts by re-normalizing the RDFs based on an estimation of the excluded volume of the particle-pairs the RDFs are sampled between, to emulate them being sampled from infinite systems. We then critically asses this new correction scheme alongside two previous methods developed for correcting the RDFs for Kirkwood-Buff Integrals, here employed instead for scattering. We present methods to discern features in the simulated signal corresponding to real interatomic structure from finite-size artefacts, and analyse a method to obtain contributions to the total x-ray scattering term from solvent-solvent correlations within solvation shells .