Just finished testing a new version of the battery with the LT1021-7 reference. From what I can measure, it seems quieter on the scope (mostly above 25KHz) than the LED version.
It's nice to be able to test without risking the whole amp
I'll probably start using the LT1021-7 in the GRHV supply as well since it needs less current to operate. I'm currently feeding it about .94mA with the base of the transistor it connects to pulling about 70uA from that as well.