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It may be more about shielding your eyes than the scope.
This sounds crazy, but push the scope out and view from under a cloth to keep the light away from your eyes, and let them night adapt again, and see how much difference there is.
You could try making a black cardboard tube and sticking it on the end of your scope, effectively extending the barrel and creating a hood for it, the same as you do for camera lenses to keep stray light out of it.
Does it take 1.25" eyepieces? I can send you a 10mm Vixen LV eyepiece to borrow for a few days if you want to see how it compares to your plossl.
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