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I own the same OTA, and though the image is dimmer than a 32 Plossl, I use a 24mm Widefield (68 degrees) as my low power eyepiece.
The true field is the same size as the 32 Plossl, but the extra magnification makes most DSOs stand out more.
there are a couple 1.25" eyepieces with just a trace more true field:
--the 35mm Orion Ultrascopic/Parks Gold Series/Antares Elite/Baader Eudiascopic/Celestron Ultima/Omcon Ultima/Tuthill Super Plossl. You might find one used or new. The field stop is about 29mm instead of the normal maximum of 27mm for a 1.25" eyepiece. They do this by putting the field stop slightly above the barrel (so it requires a lot of in-focus, not an issue in your scope). The edge is a tiny bit vignetted, but hardly severely so. This eyepiece would yield the brightest image in your scope.
--the Baader Hyperion 24mm. This eyepiece has about a 28.5mm field stop, also above the barrel. It would yield the higher power of the widefield 24s but with a little extra true field.
Just a note: the real aperture of that scope is about 121mm and the real f/ratio about f/12.8 using the provided visual back. If you shorten the visual back by cutting off the threads, and use a star diagonal with a shorter-than-average light path, you can also sneak a little extra true field because it shortens the focal length a trace.
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