Am I sure about the paces? No, absolutely not. I don't have nearly enough of a relationship with or info on you to be sure.
But that you can hit these paces is not a problem--these are "train don't strain" workouts, that set you up for big gains when when the real work of harder, race-specific workouts begins 20 (or more!) weeks downrange.
I would start at these paces at the low end range of the reps, and then progress toward the higher end of the reps over 3-4 weeks. If, once you get to the higher end of the rep ranges, all of the workouts in that cycle felt easy (as in, you never missed more than one split during a workout, and if you did miss a split it was an accident and you were able to pick it back up for the rest of the workout without going to the well), drop your paces by 5-10 seconds per mile. Then repeat (although you don't need to start at the low end of the rep range this time), and if it again feels easy, drop by 5 seconds/mile again at the end of that next 3-4 week cycle.
Again, if you struggle, even in just one or two workouts, no need to drop the paces. This is base training, there's no need to overcook yourself for November racing by burning too hot in June.