Above run finished at 9.7 hours. Started slow and picked up later. Since that LF means search is almost zero early on, it implies that the increase RAM was still an issue. So I change the LF to 2.0, which is a search reduction by 55%, and decreased LF on other tables to 1.25, resulting in the 16GiB head size from the simulations vs. 18.2GiB. This is an increase of the LF from the other tables, from closer to 1.0 with base2 buckets to 1.25, but prior to base2 buckets I always ran at LF 1.5 and the performance was about the same. This will take another 9 hours to run, so should have another point around 9pm ET.