Slow Proportional gains at idle

Hi all,
I've been working on getting my truck fine tuned. It's a '94 K1500 with a stock L31 Vortec 5.7, 16196395 ECM, and 5 speed manual. I started with the BJYL 5.7 auto $0D bin, changed to manual, copied the stock vortec timing table in, and I think I have the VE tables pretty good.

Everything's looking and feeling pretty good, but the proportional gains while idling looks really slow. It swings high or low about every 6 seconds. Is that normal? As soon as I press the accelerator it speeds up to about every second, and looks more normal to me. It's not a huge concern, but I can hear the engine lag when the O2 swings low, and it bothers me a little. Any ideas where I can tune that up?

I've also noticed a little bit of knock retard. I'm not 100% sure it's real knock, as my truck/transmission is old and noisy. I've attached the logs from idling and freeway driving. If any pros want to have a look and give me any feedback on anything, it would be greatly appreciated.

Thanks