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If it uses a 6BK4 shunt regulator tube then turning the HV up actually reduces load/strain on the H output tube...A 6BK4 acts like a CRT but essentially conducts harder when the CRT goes dark to try and keep the load relatively constant.
Pulse regulator tubes 6HV5 work the opposite way... Instead of loading down the flyback output they modulate the bias of the output tube so the input sent to the flyback matches the power level it needs to maintain stable output.
Both circuits monitor the B+ Boost line as boost voltage is a good indicator of the load demands on the flyback/the sweep width and HV level...So if you hold boost constant you should get constant HV and deflection levels.
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