Hi Julie,
I think you nailed it. Once Lr5.6 was able to finish whatever extra business it had to do during startup that Lr5.5 had already done (for lack of a better way to put it), the yield was no longer necessary. I'm leaving it in though .
Lr5.6 working like a well-oiled machine now (~same as Lr5.5 - no faster nor slower that I can tell..).
Cheers,
Rob