My 91 Oct. tune seems to be crappy as well...
Not the tune but most likely the Fuel.

 

Last few fuel-ups were at Shell with their 93. If it was fuel I would've expected 93 tune to look worse then 91... but may be I'm missing something.

 

I added Torco to my 91 Oct. After that things (knock sensor went away) got better, now that i'm back on straight 91 the knock sensor went off. I asked if the mixture was too rich, and the tuner said "no, that's not the problem", he asked if anything was loose. I said no, the car was checked up last week, nothing was lose or knocking around. Is your 93 numbers worse than the 91 numbers? or the opposite. Usually Summer fuel sucks compared to the winter fuel.

 

Negative corrections look worse with 91 oct tune. 93 still shows them, but not as severe. Knock sensor PID doesn't show anything but 0, don't know if it's to be trusted. I hope someone with a bit more tuning knowledge than me can chime in.

 

Try some BP Ultimate 93 if you've got it in your area. My ST really likes it.

 

I'm filling up with chevron (supposedly the best of fuel, and getting terrible numbers) what is BP?

 

Are you logging with ign cor 4 while logging? Cyl 4 is always unhappy. I apologize for my lack of knowledge, just trying.

 

I've added all four cyl ignition corrections to the config. You're right, 4th does look worse then others. Just wonder if the overall picture the datalog shows is a something I should worry about and work with my tuner to remediate.