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I've asked Dojo about this and he gave a clear reasoning but also said we don't have any formal guidelines or even procedures yet.
What speed should we in an A-10 maintain when holding for an Instrument Approach, and what speed envelope should we maintain during the IA up until the point where we start changing throttle settings, speed, and air brakes for the landing?
Dojo suggested 300 GS during the hold and between 230-250 IAS during the IA with the most important aspect maintaining a 2-3 NM trail distance. Are there perhaps real world IFR procedures that we can adopt without running into the issue of not always having ATC?