the reason why you get wrong voltages, is because you are simulating wrongly.
The voltages of your PSU are due to the voltage divider composed by all the resistor you have from B+ to ground, including the choke resistance and even the PT secondary resistance takes place in the game.
You need to simulate each node with the expected current, this way it will be realistic.
Then you need to buy some caps and use them in a more reasonable way: 10k and 22uF give an RC of around 1 Hz, that is typical. You can keep it as a good starting point for different combinations.
First node is the one with the highest current demand, so the one with the highest capacity, especially if you plan to keep the amp stiff even on lowest palm mutes at highest volumes (do you, really?
).
Second node it's a matter of taste if you want it stiffer go to higher values for Henry and Farad but lower in Rdc, on the opposite side you can use a resistor and a small value capacitor. But it's a good point to change the attack of the amp at different volumes.
Third node is where you need to smooth the ripple for following stages (with worse ripple-induced noise rejection), but usually something between 22 and 47 uF, with typical 4k7 to 15k dropping resistors, are enough.
Then it's up to you how to distribute the power supply: in series with two stages per node, in parallel, in series/parallel with every stage on its own node, all stages together with an higher filtration, etc...
