QSX15 hard start/extended crank times w/black smoke

[dodges15152023]

QSX15 CM2350 X105/ 610DT Versatile 1500 operating hours. Owner info, Used only during planting season, Tractor has seemed to under-perform all its life since new, DManned by unknown suspect when new by dealer, (long-story)
1)The latest issue showed itself 5 days ago during planting. Hard Start/Extended and variable crank times both hot and cold. 2)Then planting rained out, 3) owner service fuel filter and air filters=no change to cranking issue.4)So owner dropped off, I connected, inactive fault codes i.e.559,5576,6583,285,3326,5663,197,235,689,778,115,3737, 2 active i.e. 6263,6472 fan control codes, (tractor has no fan controls).

4)Connected to "remote access and control" and a this Forum known tuner had file checked and repaired in effort to start fresh and as preventive start. Tractor put into service with only active fan control faults showing. Tractor performs in field nicely and satisfactory during and after 300 acre check in.
5)Tuning updates did not effect hard start/extended and variable crank times/ w/black smoke

6)Maybe unrelated but seemed odd. Can someone shed light on Insite Exhaust Gas Temperature (calculated)
What specific/inputs/sensors does CI utilize to arrive at value.
Cold Start @40 degrees ambient temperature day.
While cranking C.I. shows EGTC variable values of 550 to 750 degrees.
7)Does this seem correct?
During full pull 60' air/seeder 70+ rows EGTC show 1250+
Will try to post crank video.Cummins X15 extended crankFaultsFaults2

note: The photo's are pre-file update. The video is post update.