Been giving this problem a lot of thought and figured I'd try a few things this last weekend. Had a hunch that I could be a spark issue. Had a spare set of coil packs on the shelf so I figured I'd check the plugs, do a compression test while they were out and swap in the other set of coil packs. Plugs all looked a nice light brown and were gapped correctly, compression was good on all four cylinders. New coil packs installed and after one test drive, I think my problem is solved. More driving will tell but for now, I think the hesitation issue is gone. I'm curious if the motor will take more timing now. Will find out later this week when I meet up with Mike again for a tuning session.