The absorption spectrum of singly ionized zinc in Ge has been studied using Fourier spectroscopy. Improved experimental conditions give more details for the p3/2 series than previously. Quantitative piezospectroscopy has been performed with compression along <111> and <100>. It is deduced that the final states of the compound C line include 1Gamma7-, 3Gamma8-, 3Gamma8+, and 4Gamma8+. More reliable deformation potential constants of some energy states have been obtained. Fano resonances associated with bound-hole states have been studied with and without applied uniaxial compression. The piezospectroscopic behavior of these is compared with that of the parent p3/2 series.