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Looks like you had a defective LVW because there is no way that any Hyperions or TMB planetaries would be any better than those eyepieces. I have tested an 8mm LVW and stars were all pinpoints from the center right out to the edges in my 10" f/4.72 reflector. I am talking nice tiny points of light here. I also put an LVW up against a barlowed 13mm Hyperion and the LVW bested it.
BTW, The field curvature is not coming from your eyepiece, it is coming from your mirror as I see it is @ f/4.5. Another thing, the field lenses of both the hyperion and the LVW do not a have a "barlow",they have a "smythe" lens.
Cheers,
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