I have both a 130 foot dipole and a G5RV, I can switch between the two and
the reports are exactly the same on 75. With 100 watts on the G5RV I
have
worked well over 100 countries on SSB 75 meters. The day I received the
Olivia for my mix w, worked Russia on it with 5 watts on 20 meters.

I use it nightly on my Navy Mars nets in the 3 Mhz area.

Like the 130 foot dipole I vary the feed line length to tune.

Hummmmm.......... :/

Both feedlines are fed from the rig to the ladderline with coax covered
with
ferrite beads at the junction end.

Try the 130 ft dipole fed with straight coax and see if you don't
see a difference then. Sure, it won't be huge, but it should be
there, and be quite noticable too on a receiver. I think this why you
are seeing no difference. .
You are "clutter" feeding both antennas. :/ Seriously.
Coax to ladderline...yuk...:/
But saying that, it's obvious it works well nuff I suppose..
I just like to stir it. It's been too slow around here lately.
But...I am serious about what I say.. If you want the vurry
best 80m dipole, feed it with nuttin but coax.
MK