Well friends I see this a little different.
In general : pushing color, bw, E6 is an absolute normal procedure with all films
with respectable results just from my point of view.
With bw you often have it the most easiest way in comparison.
With E6 it is more complicated.
In the middle is c41 because you have the possibility to correct some parametern a little.
But - that may be issue here - what have
one normaly to expect ?
A more speed with fine results ?
Indeed Kodak Portra 400, maybe also
Portra 800 have a quality reserve to
Push1 (1 stop) the most I know stated
Kodak Vision3 (in Ecn2) are absolute grandious up to Push2 (2 stops).
All the time in the past press photographers loved Ilford Hp5 with
2 stops, 3 stops pushing some stated :
" 4 stops in pushing Hp5 is also possible with aceptable results "
So what - where is the problem?
THE PROBLEM IS A VERY RELATIVE LOST
OF EMOLSIONS PARAMETERS IN REGARD
OF SOME CHARACTERISTICS (GRAIN,COLOR CORRECTNESS, TONAL RANGE [CONTRAST],RESOLUTION.)
My advice to the OP : Try it again please.
Obviously you films are underdeveloped.
So you have to add a more of developing
time.
Results should be less dark.
Perhaps you mixed time table of your instruction in REGARD OF PUSH STEPS.
ISO 200 to ISO 400 is PUSH 1
you mentioned ISO 200 to ISO 800 but
this is PUSH 2 (two stops).
At least : Superior 200 is a fine and VERY cheap film to me. It is a high resolution
emulsion comparible with other modern types (Portra, Ektra).
But Superior is just its name. ....
(Kodak films I mentioned are real superior in comparison......


)
But you have to pay much more for them.
Notice Superior 200 makes no sence to
push it to ISO 800. Also ISO 400 isn't the best choice [take an other film with box speed ISO 400].
Some try Superior 100 AND pull this film
(ISO 100).
But if you are an absolute fan OF a PUSH
Process with your unicolor developer try
real high speed films.
ISO 800 - ISO 1600 AND PUSH THEM UP
(Max. 1 Stop)
Because from my point of view avaible light with color film ISO 3200 is possible
today.
And I personaly own some shots in streetlight at night in Paris without tripot
(not allowed AND not possible) wich I don't want to miss.
Grainy characteristic and color shifts I don't carte on such motives.
with regards