I'll summarize the results from the three divisions of the Longtooth mission here (including the data from the previous post and an edit to add the final portion when i'm done with it).
Prev. result (6.4 HA): 86.0% 1.59%
LT p 1 (attachments): 86.8% 1.60%
LT p 2 (att & 2xAcc.): 86.7% 2.16%
LT p 3 (2xAccu enh.): 86.5% 2.45%
Edit: All three divisions added. HA was 6.4x, for an expected hit rate of 86.4%. The attachments gave me an effective (Hit) profession increase of 2-4%, slightly less to slightly more than that needed to break even on the extra cost of these attachments on this weapon. I did not observe an increase in skillgains with the attachments. In fact, i saw a decrease, but it's not significant. Expected crit rate was 1.6% unenhanced and 2.24% enhanced, consistent with the results.
Part 1:
Out of a total of 58509 attacks, 50801 were hits (813 or 0.016004 crits) and 7708 were misses, for a total hit rate of 0.868260
Part 2:
Out of a total of 28607 attacks, 24809 were hits (536 or 0.021605 crits) and 3798 were misses, for a total hit rate of 0.867235
Part 3:
Out of a total of 27558 attacks, 23850 were hits (584 or 0.0245 crits) and 3708 were misses, for a total hit rate of 0.8654