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13mm Hyperion or Stratus are no better than the 14mm XW as far as out-of-focus stars near the edge are concerned, and they also have astigmatism at f/6 and faster, while the 14mm XW has only field curvature. I would be very surprised if the 13mm Hyperion or Stratus was any better than the 12mm XF. The 8.5mm XF shows practically no FC, and performs brilliantly even at f/4.
DJV, for a scope as nice as yours I would not buy any of the EPs you listed in the first post, instead buy quality EPs that the scope deserves. If budget is tight, some nice plossls down to 10mm and a good barlow. Ultima style 5-element plossls are the best general purpose plossls I know of. Televue plossls are great too but they lose out because of the drop off in illumination nearing the edge - makes them feel more cramped than the Ultimas.
If it was me I'd go 12 and 8.5mm XF, a good barlow (1.8-2x), and one more for wider tfov: 32mm plossl, 22mm LVW, 24mm Panoptic, maybe 28mm UWAN (never tried it), depending on budget.
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