Good thinking, thanks for you effort mikand. However, the primary remains primary, just uploading a response page and committing doesn't fail over to the backup. I also verified that the backup device was in sync with the primary before testing. I've tried multiple browsers, emptied browser cache, used new machines..they all display the same, incorrect block page. Oddly enough, if I export the custom block page from the device it's the correct one, but the page that's shown when testing (I'm using the malware test file from eicar.org) it's still the wrong one. Unfortunately I can't reboot the device as the HA pair is unpatched, but I have tried rebooting both web and management server without luck.. Argh!
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