how are you developing your film
pre-wet for a few mins ..
then the 20mins agitate for the first min and then 10seconds every min ?
i think the vit c is OK ( rose hips are a form of vit c from what i have been told )
and it fizzed so that is good ...
you might cut your development a bit if you are getting heavily over developed film. or strip your film of its density with some sort of bleach ( like farmers reducer or another )
with the caffenol-c film you might try to make contact prints from them .. and you might
like the results ...
i sometimes have negatives so dense i can't see through them, and i either make sunprints
on regular photo paper and scan them or contact prints with a 300watt bulb
and process the prints in regular developer. you can use your caffeonol c as a print developer
as well, even after you have processed film through it ( its not 1 shot )
it takes about 2x the time for prints to appear but it works fine ...
the sun prints take a little time for the uv/suns rays to stain the paper,
and you only really get 1 or 2 chances to scan the image, but you get an image with details
that you can tweek your levels to, as you did with the scans you presented in the thread ...
you might also try a different film, and see if it is just an emulsion that
disagreeable to your offerings at "le 4stringsbass café"
have fun !