Thank you guys, it's really great to get some helps. I will try to shoot the FP4+ at 80asa and develop with rodinal 1:50 at below 68 degree, too see if it's gets better.
next is to try shoot the film at 100asa, 125asa, develop in 1:25, 1:50... I think I will get it right.
Once the lid is closed, the light can be turned on, so I really don't mind a longer development time.
Hi, Skahde, the link is great, too bad I can't read the language.