1. Yes. An MFE in experimental outputs now "high voltage" which is 512 eu/t. If you need 128 EU packets, use the new "CESU" instead.
BatBox -> Low Voltage (32 EU/t)
CESU -> Medium Voltage (128 EU/t)
MFE -> High Voltage (512 EU/t)
MFSU -> Extreme Voltage (2048 EU/t)
Over-Extreme-Voltage (2048+ e.g. 8192 EU/t like the new EV-Transformer can handle.)
2. Yes. because the new energy system (which works different from the old) is not yet fully implemented the author deactivated explosions.
In the future, not just the biggest packet size through a cable or into/from a machine matters, but the
sum of the packets of all power units in the same network.
So you can no longer connect 50 solar panels with one ultra-low-voltage cable. (50 x 1 EU/t = 50 EU/t > 32 EU/t)
You would need to split them to at least 2 of those cables so the sum of packet sizes per cable does not exceed 32 EU/t.
Same goes for machines.
You can no longer connect a HV machine (e.g. mass fab) together with other machines to a single HV cable.
Because additional machines would in sum exceed the limit of 512 EU/t of the cable.
So we have to use transformers more selectively to create kind of "power level segments" and always keep an eye on the energy passing through each cable if additional machines or power units get connected.
It's more like real electrical current now. Well "current" without voltage, actually... It's just still called this way.