High solids aqueous ink chemistries are desirable to provide high optical density and durability after application to the media but these inks can have tradeoffs in jettability due to Pigment/Vehicle separation (PiVS) and increased solvent evaporation in idle nozzles and fluidic chambers (decap) which can reduce both jettability and observed image quality (IQ). Low volatility co-solvents are commonly used to reduce decap by slowing the rate of evaporation through uncapped nozzles but these solvents have tradeoffs at the system level because final removal of these agents after deposition on media by drying can be challenging. The increased density (2400 nozzles per inch per color) of the HDNA thermal inkjet (TIJ) silicon die has been used on recently introduced HP industrial packaging printing and signage presses in a 1200 nozzle per inch configuration to enable high solids, high volatility ink chemistries with existing printhead silicon circuit designs and printhead modules by utilizing the unused nozzle positions as in-situ ink pumps to mix and flush stagnant ink from ink chambers. This configuration enables good jettability and IQ with high solids ink chemistries without requiring external ink recirculation systems.