I'm worried about the jump in overall weekly mileage.
Yet apparently there was/is no concern regarding the jump in longest run mileage and how well (or not) the weekly mileage will support it? No offense intended but that does not make rational sense. Are you married to the myth of the 20 miler? The longest weekly run is not the only or even the main thing that will get you ready for May 25th. Whatever you feel you are capable of handling on a weekly basis, the longest run (obviously, from the stated results) should not be as high as 40% of the weekly volume. It would be rather surprising if someone like Pfitzinger would recommend otherwise. Below 30% (closer to 25%) would likely be more ideal for the level of volume you want to do. Hope you heal soon and feel well enough to get after a more balanced training regimen.