No change needed.
With LT1021-10volt the current is 10V/787ohm + 1 mA from ground pin = 13.7mA.
One builder increased current to 18mA by changing resistor to 590R. Now I use 590 as well in my mini T2 DHT with Emission Labs tubes and I’m happy.
This is good.
It is about computer components, but the same factors that affect that industry affect a lot of industries.
People are going to flip when prices of consumer goods start going up.
My experience is that the balance servo is very efficient so 50 mV is expected. As for offset – 5K trimmer parallel with 510R resistor reduces highest emitter resistance to roughly 465 ohm which probably is too low. May I suggest replacing R73 (6.2K) with a 10K trimmer and keep R64 (510R) untouched? I have used that for a long time and it works great.