I was thinking about going back and reading Revolution so I took a look at the chronology notes on the TFWiki. Then I blacked out and 72 hours later this existed: IDW G1 Transformers Modular Reading Order (It doesn't copy/paste well) This reading order is chronological, with some exceptions. Drift, Autocracy, Spotlight: Thundercracker, etc. are framed as flashbacks, while ROM Vs and Hearts of Steel don't connect with the main story until a good while after they "take place", so they've all been moved downwards. The basis is that the issues that take place at the same time can be swapped around or read simultaneously, and it's been structured in a table format so that chronology moves top-down, with concurrent stories being divided laterally. There's also an entire list of oft-updated reading orders people've made pinned up at the top of r/idwtransformers [and here].