Time Machine + Drobo + 30 users =  corrupt images!!

I was hoping Time Machine would behave a little more robustly, but maybe I'm doing something wrong....
To give you a quick idea of the environment:
PowerMac G5 1.6 w/ 1GB of RAM.
Server is OD Master, running AFP/SMB. It is also responsible for handling TM backups of itself, the attached drives, except the Drobo (more on that later).
Attached are 3 external drives, 2 LaCie D2s that are daisychained on a FW400 bus. The third is a Drobo, alone on a FW800 bus. It's formatted as 8TB (so I could expand w/out wiping). Currently there are 4x 1TB cheapo Seagates that I don't trust all that much...
The Server is also for sharing the Drobo to roughly 30 workstations.
So all in all, 30 machines are pointed to the Drobo via the server, so they could all TM to it.
Things worked well for about 2-3 weeks.
As things went, backups started slowly failing, units not being backed up. Starting today, the server wasn't being backed up.
After doing poking around, there was change in authentication MO starting after 10.5.3.
I have also noticed that a number of the sparsebundles on the Drobo are corrupt.
There is a third issue, where .inProgress files get bunged up and prevent TM from doing its thing.
First issue was fixed fairly easily.
The sparsebundles are giving me the worst headache. I ran diskwarrior on the Drobo itself, which came out fine.. (complained about disk malfunctions but that seems to be attributed to Drobo itself being blindingly slow). Throughout the day, I have been running diskwarrior on the sparsebundles themselves, to varying degrees of success. Some are repairable, some make my machine lock up while doing the comparison test, others are totally destroyed.
My question is:
a) has anyone had issues with Time Machine and the Drobo?
b) am I doing something very very wrong?
c) if it comes to scrapping TM, what backup software could you recommend for this setup?
Retrospect seems like the obvious choice, but the interface makes me want to tear out my eyes. A new version is out, so I may give them another chance.
Any responses would be greatly appreciated!

My guess is you have about 3TB of usable space and are trying to put 8TB of data on it. Unless you have one of the new 8 bay Drobos you won't get 8TB of space on your Drobo until you have 4 4TB drives in it.

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