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Even cheap plossls should perform quite respectably in your scope. So, here are couple of things to consider before you spend big on more EPs:
1. Have you got collimation sorted out? Do you have a reliable collimating tool?
2. Is the scope properly cooled by the time you are looking through it?; this is hard to answer if you've never seen the difference. When temperature is dropping relatively quickly, the mirror may never get there without a fan.
Pinched mirrors are also not unlikely and easy to fix (see Geoff Starkler's depinch-howto article on this site).
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