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If you are goig to be pulling that trailer,I would richen up the part throttle mixture. You will lose torque a lot faster on the lean side of stoich. Add in the fact that you are tuning without a load right now,you will have more throttle opening(less vacuum) while pulling your trailer. Just hate to see you go too lean and hurt something.
Keith

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That makes sense. I also (think I) got some light surging at 35mph through town earlier. So, I'll go another step or two richer on the cruise side and see what happens. The trailer itself is ~3500#, and add a couple 1k# horses...

After looking at todays logs, I may need a longer pump shot as well. WOT seems to be fine, but at slow acceleration AFRs tend to jump to 18ish for ~1s, then go back to normal.

Thanks again for all the help