Setting radiators without TRVs (room thermostat)

Soldato
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I'm hoping there are people in the know here.

My home has 2 thermostats.

Living room controls the while house including upstairs with the exception of the main bedroom.

Main bedroom thermostat controls only main bedroom.

Now the radiators in the living room and bedroom do not have TRVs as the room stat would control them.

Given there is no balancing issue for the bedroom side (as it's 1 rad on its own circuit) should the lock valves on the radiator in the bedroom be fully open or would this affect the efficiency because the water leaves the rad at a rate that is too quick?

Is it better to have the input side fully open and the return side closed down a bit? (advice I have seen so far is to have circa 12oC difference between input and output ffor effective heat flow)

Hope this all makes sense as to what I am asking
 
Makes sense. I do have them on differing schedules so they shouldn't overlap.

I am concerned that having both fully open would be inefficient as the water would be too hot as it left to go back to the boiler (condensing type)
 
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