Dear Rick: Somewhere the cartridge/cables are " taking " that hiss and even the own cartridge could generate if is out of builder specs ( a faulty one ).
It is very difficult to fix a hiss ( is more easy a " hum ", that is difficult too. ) because could comes from everywhere. I can't think that this comes from the phono stage because you experience it with two different phono stages.
What if you change the cable " orientation "/position or even the TT position. Do you already try with other cartridges that your Glider? with other tonearm cables ( this is important too. )? even inverting ( with a sheater-plug ) the power cables connection .
I think that is worth to try it to have a better idea of what is happening " there " because that hiss could come directly from the TT, we can't know it for sure: any of your system devices can " help " to that trouble, even could be static.
Now, I'm assuming that your system is right on the overall set-up with non-parallel near signal and power cords, everything that needs is grounded at one and only one point, etc, etc.
When do you start/begin to have this trouble? was suddenly? or you change something.
Regards and enjoy the music.