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Since I've never experienced what you experienced with any eyepiece, I can only speculate:
--the much wider field meant you were constantly shifting your gaze from here to there all over the place, rather than keeping your eye pointed straight ahead.
--you were so enthralled at the image you forgot to blink. And the after effects of a dry eye are bothering you.
You might try rolling your head over a bit to look at the edges of the field to keep your eye from straining sideways that much. After all, that's what you normally do--when you want to look left, you don't hold your head still and move your eyes, you move your head and look left.
But there is nothing inherent in the eyepiece that would lead to any symptoms such as described, so I'm guessing my explanation is probably correct.
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