I would keep everything at the same temp. Look into getting a Jobo processor or Jobo tempering bath. They make it really easy to getting temps all the same.
Originally Posted by albada
I'd suggest using a two-bath fixing scheme. The oldest fixer bath gets used first and then the freshest fixer bath second. That way you do all the heavy fixing with the first bath, and then the second bath can clean up the last bits of unfixed silver.
I think a two bath fixer scheme would even out variations in fixer life-cycle.