Correcting the ps there was still high current draw above 50 percent mains ,
so re-engaged the triac cct

Now powering up via the mains plug proper, via the on-demand triac, the
mains current is stable at 210mA at 70 percent of 240V . No hotspots but
will take various voltages on ps and both ch, with loads on outputs, before
upping any more.