I'm a bit confused because of the last paragraph, so I'll try to reconstruct your layouts.
Your old layout (I reduduced it to the relevant parts):
Display Spoiler
(The ones in the front are left, 
= Nothing)
Ok, I assume that the left ones take too much power from the MFSUs: They just eat such a lot of energy that they empty their energy storages fast enough to take a majority of the 512 EU packets before these reach the right ones. The right ones just don't get enough energy, because the left ones are before them in the energy grind (or better line).
Now your changes:
Installed an LV transformer rigged to emit EV (feeding off of the same MFSU bank, no major layout changes)
I assume that you meant an EV transformer, because EV is too much for a lV transformer.
New layout:
Display Spoiler
( 
= EV transformer) :Macerator: :Macerator: :Macerator: :Macerator:
:MFS-Unit: :Glass Fibre:
:MFS-Unit: :Glass Fibre:
:MFS-Unit: :Glass Fibre:
:MFS-Unit: :Glass Fibre:
:MFS-Unit: :Glass Fibre:
:MFS-Unit: :Glass Fibre:
Now the right ones don't empty their storages fast enough to have enough free energy storage to take the EV packets before these could reach the left ones.
Display Spoiler
That's also the reason for the annoying on/off of the :Geothermal Generator: s. 
I hope that I could help you.
Edit:
(Just a small correction of the last spoiler. Now it works properly. 
)
)