Set something up, then change one thing at a time, try different tubes see what it dose to your voltage . Gee dose raising the second cap from 100uf to 220uf do much?

Take one transformer, say your 275-0-275 and run it thorough it’s possible permutations

full wave. Cap input.
Full wave Choke input

full wave bridge same as above.

Hey for extra credit try have wave.

A few pointers on using Psu2

referring to Damir’s post. You see that he runs for something like 2000ms after a delay of 0 sec.

I like to change the delay to say 30 sec sometimes to see what is going on after things settle down. Just beware that the graphs will look nasty , until you look at the Y axis and see how small it really is …John