NEC-LIST:Question about the plate in SuperNEC

When I use SuperNEC to simulate my antenna (operates at 144Mhz) which is
5cm away from a plate, I found that the default diameter setting for wire
segments used to construct the plate is about 30mm when the segment length
is 0.1m. I changed the wire diamater from 30mm to 2mm and the simulation
results (antenna impedance, coupling etc) are quite different from the
actual measured one. When I use the default 30mm setting the simulation
results are closer to the actual measured values. Is there any particular
reason to use such thick wire segments to construct a plate? Does it mean
that the wire segment length of 0.1m is too long for 144Mhz? I think 0.1m
should be short enough for 144Mhz and the software does not give me any
warning either.

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