Log FLKC fine knock learn if you see negitive flkc or fbkc you getting small amount of knock and that will hold iam lower than 1
this may be occurring only in one specific load\rpm range
do several light throttle runs in say second from 2000 to 6500 or so should reset iam to greater rhan 0.7
This is pretty normal if your not on good 93 fuel, as your on 91 you will likely always get small amounts of knock indications which will keep iam down
What you need is a specific 91 tune if you want iam at 1 and minimal knock indications
can sort a 91 fuel tune for you if needed
full story here
https://www.romraider.com/forum/viewtopic.php?t=1840