NEC-LIST: What am I doing wrong and/or don't understand ?

Someone who can give me an answer or suggestions
about what I am doing wrong ?

Below I have listed 2 (simplified) Nec2 models. First a simple
dipole/inverted-V model, fed with open-wire line.
In the second model I have removed one of de dipole wires to
get a kind of 'zeppelin' antenna. The feedline is left as it was.

When looking at the far field pattern for at all Thete/Phi angles
with 5 degree increment, it seems for 90% of the cases the 2 wire
antenne outperforms the 1-wire antenna for some 4-5 dB's. For those
few angles where the 1-wire antenne outperforms the 2-wire the
differences are much less.
I am asking myself why the 2-wire antenne seems to work much
better tahn the one-wire antenna.

Probably it's something stupid I have missed, but I still can not
find out what I it is....

When doing an average-gain test both deliver a value of about 1.11,
saying one should interpret the results with care...
But, because both models deliver almost the same average-gain value,
I would think, although maybe a bit doubtfull, both models
can be compared with each other.

============================================

CM 2-wire model
CE
GW 1 26 -.015 0 2 -.015 0 20.0 6.3e-4
GW 2 26 .015 0 2 .015 0 20.0 6.3e-4
GW 20 1 -.0212837 0 1 .0212837 0 1 6.3e-4
GW 21 6 -.0212837 0 1 -.015 0 2 6.3e-4
GW 22 6 .0212837 0 1 .015 0 2 6.3e-4
GW 31 6 -.015 0 20.0 -.0212837 0 21.0 6.3e-4
GW 32 6 .015 0 20.0 .0212837 0 21.0 6.3e-4
GW 51 258 -44.0 0 15.0 -.0212837 0 21.0 .0005
GW 52 258 .0212837 0 21.0 44.0 0 11.0 .0005
GE
GN 2 0 0 0 14 .006
EX 0 20 1 0 1 0
FR 0 1 0 0 7.05
RP 0 37 73 1000 -90.0 0.0 5.0 5.0

===========================================

CM 1-wire model
CE
GW 1 26 -.015 0 2 -.015 0 20.0 6.3e-4
GW 2 26 .015 0 2 .015 0 20.0 6.3e-4
GW 20 1 -.0212837 0 1 .0212837 0 1 6.3e-4
GW 21 6 -.0212837 0 1 -.015 0 2 6.3e-4
GW 22 6 .0212837 0 1 .015 0 2 6.3e-4
GW 31 6 -.015 0 20.0 -.0212837 0 21.0 6.3e-4
GW 32 6 .015 0 20.0 .0212837 0 21.0 6.3e-4
GW 51 258 -44.0 0 15.0 -.0212837 0 21.0 .0005
GE
GN 2 0 0 0 14 .006
EX 0 20 1 0 1 0
FR 0 1 0 0 7.05
RP 0 37 73 1000 -90.0 0.0 5.0 5.0

============================================

Thanks in advance
Arie Voors

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