The solution to powering an EBF has always been 3 LV energy hatches, with each hatch fed by 2 LV generators (Turbines or Diesel). And out of those 3 hatches/6 generators, 2 hatches/4 generators will take full load, and the 3rd/last 2 will take partial load to make up for the inefficiency of the first two/four.
In my current game I've used a bit different setup - 4 lower-tier energy hatches with equivalent tier diesel generators attached straight to them with no cables or battery boxes between. As long as I was providing enough fuel for the generators I was smelting several stacks of aluminum/titanium (with 128EU hatches/generators) without issues.
Only problem is that you'll need to be able to access the furnace from the bottom since you'll have all nine blocks of the bottom layer be in use in some form. I have my BF on my second floor of the machine shop so access is trivial from the first floor.