Yeti 300 with Nomad 50

Hello! We're using a Nomad 50 to charge the new Yeti 300. In constant bright sun the best we're able to get is about 20 watts from the panel. That seems really low even with lower efficiency expectations. Let's assume the panel is not the problem - is there something we should be doing on the Yeti 300 to troubleshoot for a better yield? Firmware update? Something on the app?