Wooden Conductive Pipes have a max storage of 1000 MJ, Golden also. Wooden pipes lose 1 MJ/100 ticks and they also lose 1% of the received energy by default. Golden ones lose 0.01% power. The pipes are exact (using double as the chosen format), while the machines use int. So 10 MJ become 9.9 MJ after Wooden, becoming 9.89901 MJ after Golden, becoming 9 MJ in the machine.
Another thing:
MFE -> LV Trafo -> ... uses 72 EU/t? LV Trafo has a max output of 32 EU/t and its internal storage is only 256 EU, so after a few ticks it should only use 32 EU/t max, since the LV Trafo acts as a throttle.
The Energy Link fills its internal storage of 2500 EU as fast as it can and after that uses only as much as is needed to become full again. The output asks the recipient how much it wants and then gives only that. If the recipient always wants everything, regardles if it can store it, then there is much loss involved, because the Link just trusts the recipient.
The Quarry answers with a loud GIMME ALL on the questions (25 MJ in building phase, 200 MJ in digging phase), regardless of its actual needs.
Yes, this is in contrast to my last posts, where I made a mistake regarding the quarry. Forestry machines, which use BC-Style energy, ask only for the needed amount. BC machines are dumb and want all. Using a throttle like a LV Transformer or Batbox is the way to go (but still: always connect the Energy Link directly to its target and scrap the power pipes).