John,
Congrats on the new IB. I have had similar experiences with Ultra x. You have to go real loose for break in and keep adjusting for the first 5 or so hrs.
The graphite packings will generate higher temps I am told because they transfer heat better. I have had 140 on break in and backed off a few times to get temps down. Runs cooler now but have had to adjust a few times over the last 70hrs. Do you have 1.25 shaft and are you using 1/4 "packing?
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