You don't have to do anything....
Recovery may not happen very locally but it will happen, and not everything separates at a shockfront, at a tail section it must at some point recover, the question is how far aft of the tail it does that, if you have a bluff body on one shape and a boat tailed shape on another there will be a difference, and that will include how the tail shocks behave, and using a model that is more comparable to an AIM-9B with a rounded dome nose and pretending that that is comparable to the profile of an AIM-120 (which this topic is about) is not a valid comparison or argument, such a shape will always generate more drag than a nose profile like the AIM-120 in the circumstances of this thread, and that link about the missile provides no actual data on the missiles drag coefficient at all, it's not featured in it, so saying one is showing more drag than the other, and citing that source is not valid either, so no conclusions can be drawn in either direction from that.