Check the entire CCV system...including drain to oil dipstick tube...it clogs easily, although in Texas, it should generally be clear of mayo..

A very small vacuum leak could lead to the elevated LTFT's you have. I don't know how you are smoke testing. But I can tell you a smoke test looking for a +10% LTFT needs to be a lot of smoke under pressure and you need to smoke from intake boots, brake booster, etc...

Check the rubber caps on your intake..there is one on the CCV valve and 1-2 on the rear of the intake near the firewall. The fact that you have similar LTFT's on banks 1 &2 tells me the vac leak is likely before it gets into the intake...