Anyone here have good luck adding borax to developer?

[slashmaster]

I'm processing old 4x film with a certain amount of haze. So I tried overexposing it a bit and under developing at about 7 minutes to reduce it to this level.

https://www.facebook.com/ShildFilm/phot ... =3&theater

I heard adding borax to developer could help it more. So I put in a spoon and a half full and tried again at 6 minutes. Got what's on the bottom right.

https://www.facebook.com/ShildFilm/phot ... =3&theater

The top one was when I shaved off a couple minutes more, made little difference.

So what do I do now? Was a spoon and a half way too much borax? Judging by how dark it is, maybe 1 minute is the right amount to develop it? Or should I toss it all and mix up some more? Just how much borax should I use to get rid of film haze?