Gonk have some questions for you with the BDP-93 Setup followed everything I could on your 990/83 guide:
Playback Setup: I'm not doing SACD so do I leave everything in this menu to default?
Yes, defaults should all be fine.
Video Setup:
Picture Adjustment - just leave this alone?
1080p24 Output - default is set to Off is this ok?
HDMI Options - leave at defaults?
Display Options - leave at defaults?
I have 1080p24 turned on, but my display also supports 24p. If yours does, I'd enable it. I also disable the sceensaver under Display Options, but that's just me. Also, if you plan to use 3D, you should probably set your screen size. For 2D modes, it isn't really important and you can leave it on the default of 46".
Audio Processing: crossover default is 80Hz is this ok?
Since you're using the 990, you should have all speakers set to large. Therefore, the crossover isn't actually being used. Doesn't matter what it's set to since it isn't being used.