Grid codes specify asymmetric fault-ride-through requirements through a single minimum line-to-line voltage magnitude, which does not define the fault type. Earlier work spanned the reachable set of these fault states on the grid side. This paper asks what a converter can usefully do within that set, and what stops it. Grid-following k-factor droop control and grid-forming virtual-impedance control are compared for a 50 MVA plant on a 110-kV radial feeder. A quasi-steady-state sequence-domain calculation covers 81 fault conditions and is validated against electromagnetic-transient simulations. Four criteria are analysed at the same time: positive-sequence voltage support, the upper limit on the highest of the three line-to-line voltages, the peak phase-current limit, and the reactance error seen by the feeder distance protection. No single fixed parameterisation performs well across the whole range of grid strengths and fault states. Therefore, robust optima are analysed and it is also shown that the two control paradigms convert overcurrent capability into voltage support at different rates.