I guess my suggested change for centrifuging lava would be:
Input: Lava x 64
Input 2: Empty
Output 1: Obsidian dust x 40
Output 2: Gold x 8 (as oppose to electrum)
Output 3: Copper x 8 (down from 16?)
Output 4: Tin x 8 (down from 40)
Current output of tin for centrifuging lava is already 8 ingots. Plus the total cost of the cans used. Look at the three recipes. One for lava cells (40 tin output) one for lava cans (24 tin output), one for wax cans (8 tin output) and one for still lava (8 tin output) achieved by just pumping lava into the centrifuge. The output is always 8 ingots more than the cost for the 64 cells/cans.
Why are you changing the Tungsten dust to obsidian? Tungsten isn't rare now, and is of extremely limited use until you have fusion setup, and the obsidian is like a backdoor way to get iron out of lava again (which was removed, compared to 1.4.2 which had pyrite instead of copper - 40 obsidian will centrifuge to 5 iron)
And silver is basically an empty ingot unless you use factorization mod to process ore- and only more needed then until you get your solar power setup, so again the change from 6 electrum to 8 gold almost seems like a backdoor way to actually make centrifuging lava more useful.
So in short, the only meaningful change you're suggesting that isn't actually making the output more useful than now is the copper, and I'm wondering why you care so much for that single change?
Guess that's why everyone is pumping Lava from the Nether or making advanced solar panels. Having an automated treefarm setup is much more complex than simply pump lava. That thing alone is the biggest issue there is with the current mod packs: lava energy is too easy and too good.
"Everybody"?
Last night I pumped a huge lava lake into an iron tank because the lake was in my way of construction, and it just sits there. My EU power generation is currently 20 gas turbines, being self powered by methane from a rubber tree farm and 10 centrifuges (The number of centrifuges is excessive, I think balance would be 4 or 5).
There are lots of methods of EU power generation that are input free, and you complain about lava? Once you can run an industrial centrifuge and have some marble, windmills are dirt cheap. Have redpower provide buckets for watermills and you can generate completely maintenance free in reasonably high EU density. Charcoal can be converted to methane at a profit of about 80k EU per charcoal.
Pumping from the nether is far more for magmetic MJ engines than EU.