Grado Platinum 3 Low Output and McIntosh C11 Preamp

I have a VPI Scout Junior turntable with a gimbal arm and a factory pre-mounted Ortofon 2m Red cartridge which I use with my vintage McIntosh C11 tube preamp.  I am thinking of upgrading my cartridge and I have read a lot of good things about the Grado Platinum3.  I wrote the company and they suggested I go with the low output version which is 1.0 mV.  The C11 has about 60db of gain in the phono stage and currently if I crank the volume knob up to the 12 O'Clock position (way beyond any reasonable listening level) I can hear hum.  When I have the knob at the 9 O'clock position (my normal listening level) there is no hum.  What I worry about is if I buy the low output version of the Grado, will I potentially be running into hum and other noise issues if I have to crank up the volume to hear music at my normal listening level?  I was considering the Ortofon Bronze first, which I feel won't have this issue, but I am so curious about the Grado.

Any help would be appreciated