Yes - it is that hard to follow. Are you testing a drive, or an array? You aren't being clear.
Your last benchmark shows you are bottlenecked by the controller - as most cheap controllers are garbage even in RAID0 (let alone RAID5) I would junk that card completely. If you want to keep going with it, then forget RAID5 for starters, and just update your drivers. You won't get more than 100MB/s out if it though as it's a PCI card - that's all you'll get out of the bus. That may well have been your issue in the first set of benches too - anything else on the PCI bus at the same time will result in the crashes to 0MB/s you observed, as the bus is busy with the other transfer, meaning the card can't transfer anything at all.
Without knowing more about your setup (card model, chipset, drivers, drives, array parameters, system specs) that's about all the help we can offer.
And posting just the scores without the benchmarks is meaningless too - if we can't see the plot we can't diagnose many of the issues.