If the screen is connected by HDMI I would suggest to try adding the following entries to /boot/userconfig.txt:
hdmi_group=2
hdmi_mode=87
hdmi_cvt=1024 600 60 6 0 0 0
Using userconfig.txt has the advantage that your own entries remain untouched when Volumio gets updated. In contrast /boot/config.txt file gets overwritten (further information).
Since max_usb_current=1 and hdmi_force_hotplug=1 are already part of the “standard” /boot/config.txt there is no need to add them to userconfig.txt, too.
I can’t say if config_hdmi_boost=10 is required. As stated here the default value for your Raspberry should be 5. Personally I would start with the default value and change that only if HDMI issues as described in the previous link should occur.
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