It's difficult to predict whether that fence is doing any sort of decent job for you or not. If you have the wire connection from the vertical base to the fence handy to attach and then remove, you should be able to tell whether it's doing anything based on antenna resonance, and to some extent even by what you can hear on the receiver.
The DX-88 will not fare well without a good ground radial system. The "earth rods" might help with lightning transients, but don't make any sort of RF ground system for a vertical.
Re IARU Region 1 vs. Region 2, what are the actual differences? I can think of one, which is 40 meters, where you guys are centered lower in the band than we are here. Other band differences? This may amount to "very little," or possibly "nothing."
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-- George Bernard Shaw