I read some of your post... I would imagine it might be the little things and it can get frustrating... just don't get frustrated.... as for this print the paper is fogged, but I see you posted a newer image and it has some whites. My only humble advice would be to make a check list of possible culprits and work on each one till you eliminate the source. Such as .... Paper, Chemistry, and Darkroom Light Tightness.
Thanks for your advice it turns out that it is the little things as I'm now pretty sure it has been a light leak (now cured) that contaminated some paper. Many Thanks.