I recommend against using narrowbands or fuel trims... Ever. It may wind up confusing you and keep you chasing your tail. The fuel trims probably vary based on temperature judging by what I've seen my logs do in open loop. In any case the target of a narrowband sensor (14.7:1) is never desirable.
Tuning is usually done by disable the narrowbands and in open loop, populate table data like this
Then simply adjust your VE table as needed
Here are general targets for typical engines ("normal" compression ratios and such)
00 - 19KPA: 13.3 to 13.8:1 *do not run lean a/f ratios here due to tip in concerns and situations which peg these pressure values after high load
20 - 60KPA: 14.9 to 15.8:1 This is general idle/cruise range, run lean to save plugs and reduce carbon
60 - 70KPA: 14.2 to 14.4:1 Gently accelerating up a hill or something
70 - 80KPA: 13.3 to 14.1:1 Starting to demand torque so give it a little fuel for safety and torque
80 - 90KPA: 12.6 to 13.2:1 Pretty much nearly wot so start thinking about wot ratios and full torque adding
90-105KPA: 12.0 to 12.6:1 WOT for NA engine, I like 12.2 to 12.4 , if higher compression or 87 octane maybe 12.0 is warranted
105-150KPA: 11.6 to 12.2:1 Up to 7psi of boost, should not be much richer than 11.8, those factory 2L and 3L JDM Engines run up near 12.5 here at 8.5:1 compresion
155-215KPA: 10.9 to 11.5:1 For stock LS and JDM engines I prefer to see 10.8 to 11.0 at roughly 1 engine power doubling (215KPA) on the in-car wideband
215-250KPA: 10.7 to 11.0:1 It is rare to move richer than 10.6:1 for traditional setups as we are discussing
Notice we never really want a 14.7:1 ratio - narrowbands are kind of useless.