hello bonk
great to see you here !
I would
not use x tol, if you have
PRINT developer
you might think about using that ! I know I didn't answer your question
but
xtol ( at least for me ) is a low contrast developer, and with old film that is 35-40 year old
it will be
foggy and
lacking contrast to start so
with x tol the cards are stacked against you
I am not sure where you are, but I would look for PRINT developer like DEKTOL or something similar
all purpose plain vanilla print developer .. I would dilute it 1:5 and process your film in it for about 7 or 8 minutes
but that's me, I am sure there are others here who will be happy you use x tol and suggest insanity like stand developing
I look forward to the images you are able to rescue !
John