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Pretty sure I know what the problem is now. I remembered that while I was doing the valve stem seals, I ran into an issue with my valve stem holder attachment for my air compressor. The compressor had too much pressure and actually cycled the motor when I first connected it. After that, I lowered the pressure and had no issue, but that means the lower timing chain moved while the upper timing chain was off.
I put the crank pulley back to the TDC mark after that happened, but its possible I left some slack in the chain so the lower chain may be a tooth or two off in relation to the upper chain. So while I properly timed the cams to the idler sprocket, I most likely didn't properly time the upper chain relative to the lower chain on the idler sprocket.
Doing some research on the timing chain being off by a tooth or two, the symptoms sound like mine. Exhaust is noticeably louder than it was before (thought it was just because I installed headers at the same time as the valve stem seals), feels slower than a KA should, and bogging/hesitation.
Thank you mechanicalmoron for suggesting this. While I was confident I had timed the cams properly, I figure the lower chain might have been slightly off because I just went by the crankshaft mark rather than the idler sprocket timing dimple. I'll update with my findings, whenever I am able to get to it.
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