  Ground-based high-resolution spectroscopy (HRS) has detected numerous
chemical species and atmospheric dynamics in exoplanets, most notably ultra-hot
Jupiters (UHJs). However, quantitative estimates on abundances have been
challenging but are essential for accurate comparative characterisation and to
determine formation scenarios. In this work we retrieve the atmospheres of six
UHJs (WASP-76~b, MASCARA-4~b, MASCARA-2~b, WASP-121~b, HAT-P-70~b and
WASP-189~b) with ESPRESSO and HARPS-N/HARPS observations, exploring trends in
eleven neutral species and dynamics. While Fe abundances agree well with
stellar values, Mg, Ni, Cr, Mn and V show more variation, highlighting the
difficulty in using a single species as a proxy for metallicity. We find that
Ca, Na, Ti and TiO are under-abundant, potentially due to ionisation and/or
night-side rain-out. Our retrievals also show that relative abundances between
species are more robust, consistent with previous works. We perform spatially-
and phase-resolved retrievals for WASP-76~b and WASP-121~b given their high
signal-to-noise observations, and find the chemical abundances in each of the
terminator regions are broadly consistent. We additionally constrain dynamics
for our sample through Doppler shifts and broadening of the planetary signals
during the primary eclipse, with median blue shifts between $\sim$0.9-9.0~km/s
due to day-night winds. Furthermore, we constrain spectroscopic masses for
MASCARA-2~b and HAT-P-70~b consistent with their known upper limits, but we
note that these may be biased due to degeneracies. This work highlights the
importance of future HRS studies to further probe differences and trends
between exoplanets.
