Hypotheses: iPhone3G cannot sync to 2 computers with audio&photo separately

Sorry, the Subject line was too long.
My hypotheses is that with a iPhone 3G, it is not possible to sync the iPhone 3G with 2 Macs such that the one computer supplies photos, while the 2nd computer supplies audio.
Versions:
iPhone 3G, Firmware 2.0.1 & 2.0.2. No jailbreaking. iTunes 7.7.1. Leopard on both machines. Mac#1: MacBook Pro Rev A, Mac#2: PowerBook G4 15" Rev A
I have 2 Macs. My personal Mac#1 has my photos. Mac#2 has my audio (audiobooks, podcasts, garden variety AAC & MP3 files. No DRM iTunes store music).
My mail, contacts, calendar & bookmarks sync to Mac#1, Mac#2, iPhone 3G via MobileMe without issue. This means mail/contacts/calendar/bookmars are uninvolved with USB syncing.
I can load photos onto the iPhone 3G by connecting to Mac#1. In iTunes, I uncheck "Sync Ringtones", "Sync Music", "Sync Podcasts", "Sync Applications". Nothing selected in the Video tab. My selected set of photos go over to the iPhone just fine.
On Mac#2, I select "Sync All Ringtones", "Sync selected Playlists", "Sync selected podcasts (1 most recent)", no video, "Sync all Applications".
After syncing, things are perfect, the iPhone 3G has all my data as I like it. It works.
But if I want to add more photos, I attach to Mac#1, and the problem starts there.
Before I sync, I check the settings on the iPhone tab in iTunes. Unfortunately, they show that the sync boxes for "Ringtones", "Music", "Photos", "Podcasts", "Applications" are all selected.
If I press the Sync button now, a backup occurs.
Then messages like "Podcasts on the iPhone cannot be synced because all of the podcasts selected for syncing no longer exist"
Then I have end up with an iPhone that has no music on it. Has photos though.
If I unselect the "Sync Music" checkbox, the Sync buttons changes to Apply. Click Apply still creates a iPhone that has no music on it.
If I unselect the "Sync ringtones" checkbox, a message pops up asking "are you sure you do not want to sync ringtones? All existing ringtones on the iPhone will be removed". Same thing happens i I unselect "Sync Applications".
Whatever happens, I end up with a iPhone without music.
Good thing is that, the photos are always preserved on the iPhone. Which means, I can reconnect to Mac#2 to get my music again.
I find that these settings don't matter:
* if iTunes is asked to automatically sync on attachment
* if iTunes on Mac#1 is asked to manually manage the music/video
* if I use smart playlists to sync podcasts, without using the podcasts tab in iTunes
I bring this up because, this is similar to the behaviour of my iPod nano 3rd gen.
However, I am sure that with original jailbroken iPhone with firmware 1.1.4 (jailbroken because I'm in Australia), I could do this seamlessly. I'm guessing, that the jailbreak process adjusted something that allowed the iPhone to do this.
Also, my experiences varies from the ones on http://www.iphoneatlas.com/2008/01/25/manage-iphone-syncing-with-multiple-comput ers/
And finally, my experience varies from other people who seem to have managed to accomplish what I'm trying to do, on various blogs. However, I am unable to replicate their experiences.
If I want to preserve photo syncing on the iPhone, and yet still update the playlists on the iPhone, I'm guessing I could just make it a routine to
1. Sync on Mac#2 first
2. Sync on Mac#1 to update my photos, and erase all music then
3. Sync on Mac#2 again.
Alternatively, I could live without updating my photos on the iPhone, which is a shame because:
1. My photos live on Mac#1, and syncing allows me to grab photos off the iPhone camera onto Mac#1
2. The Photo-viewing experience on the iPhone is stupendous.
I call this a hypotheses, and am throwing it out there in case someone can disprove it.
Thanks.

Dear Chik,
fina analysis. I am experiencing similar problems. I have my music/podcasts on my Work macmini, while I have Photos on my Home laptop. Whenever I connect to my Home laptop it either removes my podcasts (not the music though) or the photos. I haven't yet done a thought experiment on the different settings, but it seems I'm hitting the same wall as you do.
This link might be useful though:
http://www.andrewgrant.org/2008/03/30/how-to-sync-an-iphone-with-two-or-more-com puters.html

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