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Optimal magnification for an 8" on the planets is probably about X200 to X250, where the image will be bright enough and floaters in your eye don't start to become objectionable. If you aren't already seeing detail a wealth of detail at X250 you won't see it suddenly at X380.
Its highly unlikely you have a bad eyepiece. When you defocus a star a little, is the secondary mirror shadow centered> Are there fine dark rings that are clear and sharp ( the fresnel rings) against the bright background of the defocused star. If these rings are not visible its unlikely you will see much planetary detail do to bad atmosphere, poor optics, inadequate cooling or some combination.
Planetary observing takes time and practice. Don't be in a hurry and you'll get there.
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