In the past I've created EqualiserAPO config files that will change your current 2018 Harman Curve to a 2013 Harman Curve or to a 2015 Harman Curve. If you like wack those on top of your Oratory EQ profiles to simulate what it's like when the headphone is EQ'd to the different curves:
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It might be a quick fix for you to tune an Oratory EQ to your liking. You'll need to use unadulterated Oratory EQ's in order for it to convert it accurately, so remove your own tinkering before trying. As you can see the different versions of the Harman Curve have different levels of bass and treble, and a few small other characteristic changes. In Equaliser APO you'd simply have Oratory's EQ config file activated, then you'd activate one of the following config files too, which is what converts it to either the 2013 or 2015 Harman Curve - so you'd have two config files in EqualiserAPO active whilst you're doing your listening tests.