I'm sorry that you have had so many struggles with LANDesk Provisioning. You are not alone. We have been aware of these challenges for some time.
You indicated that templates fail randomly, or work one day and not another. That is something we focused on for SP3. We did extended testing on a large scale to help improve scalability and reliability. Last I heard we had run over 20k tasks.
You can find more information about SP3 here: Management Suite / Security Suite 9 Service Pack 3
Specifically on OSD, HII and Provisioning: OSD, HII and Provisioning in LANDesk Management Suite 9 SP3
If your OSD deployment tasks are relatively simple, you may have better success using the OSD tool (scripts) instead of Provisioning Templates. You lose the flexibility, but it is much simpler and more like the DVD you said you used to send.
I'm not sure where your template originally came from, but if you are concerned about that, or would like more specific assistance, feel free to contact LANDesk Support and we can help out. SP3 will really help with reliability.
We do have customers who do hundreds of OS deployments daily. I don't want you to have all this extra work and escalations at 10PM, so hopefully we can get things running more smoothly for you.