Light Leak Help?

Hey guys, I have a Canon A1 - 50mm FD f1.4 lens SSC. I have replaced the light seals around the door, but not seals near the hinge (should’ve done). I’ve checked the shutter curtains, before and after advancing and there’s no holes I can see.

Just got the scans back from the lab, and there’s a lot of leaks. I’m struggling to get why some photos have come out fine and others have come out really bad. About half of this test roll is spent, Kodak Gold 200, shooting at box speed.

I’ve also included some 26 years expired portra 400 for reference (unknown storage conditions). Doesn’t seem as bad but I shot that two stops and 3 stops over.

Any help would be massively appreciated