Hi there
Sounds like your after some smaller focal length EP's ( ie: more zoom) with a larger FOV (ie: less chasing objects). I'm not sure what the FOV is on the GSO plossls, but ive got the same EPs for my 12" GSO dob, and I upgraded pretty quick too. But since upgrading to the the Baaders I've got now (see below), I've found that I hardly ever use anything above an 8mm, and even that only comes out on nights of almost perfect seeing. At high mags, any poor seeing is also magnified by the EP, and it's very easy for your eyepieces to push your telescope beyond it's capabilities and degrade what your seeing.
My advice would be to get used to looking at lower magnifications for a longer time as it passes through the FOV rather than go for high magnification views for a few seconds at a time. You'd be surprised at the subtle details your eye can pick up even at lower magnifications if it's given enough time to see them.
That said, there are some good mid-range EP's out there with good FOV's, Orion Stratus and Baader Hyperion are the two that come immediately to mind, and depending on your budget, you could always aim for some Televue Ethos', though they're pretty pricey.
Davin
