honashagen, I assume that when you say the upper mids are killing you, you mean that your system is too bright or harsh. That problem can be caused by any of the components in your system or any combination of them.
Do you have a friend whose components you can swap into your system one at a time to see if you can find the offending component? That would be a good thing to do before you start spending money.
I'm surprised that the Primaluna amp isn't working better for you. It should have no problem driving those speakers. I would call Kevin Deal at Upscale Audio and discuss it with him. He's the expert on Primaluna amps and can probably help you out.