Hey guys looking for some Integra expertise please. After failing emissions testing in Canada I am chasing the cause of my rich condition.

The car is a '96 Civic Sedan I just purchased, it was a deal too good to pass up. Freshly re-built and swapped B18b with about 8,000km on it so far, S4C b16 trans re-built, on an Integra subframe blah blah. So the car is running a STOCK Integra exhaust right now, with a cat (apparently less than 2 years old, the previous owner who built the car had a test pipe in for a short while) and a decent short ram intake with a new filter. So all the cap+rotor+plugs+wires are NGK and new. The car runs flawlessly, gets up to 90 celsius and sits there, rad fan comes on around 92C. Anyways it passed safety fine since it's all re-done and nice, and it failed the emissions test (Drive Clean Ontario) miserably. It was a 2 speed idle test so they had the sniffer in the exhaust, idle was ok but a bit high on the HC hydrocarbons and carbon monoxide. 2500rpm was a different story and the car doubled the limit for HC and CO. I swapped out the older oxygen sensors for my newer Denso units because I know they work, only a few months of daily driving on them.

Anyways, just wondering if anyone had some helpful suggestions as to where to look for the cause of my rich condition. Using torque pro (I know) on my phone I have a good OBD2 adapter, and I pulled O2 and timing advance numbers. O2 #1 was sitting high voltage the whole time, not fluctuating. O2 #2 was switching/trimming nicely and gave a good wave on my graph. Timing advance is average 15-16 degrees at 750rpm idle not sure if that's out to lunch or not but as I said, engine pulls happily with NO CHECK ENGINE codes whatsoever.

Well this turned into a novel. Thanks for any input!