Understanding my car is running rich, I took a look at my BLMs, and they are most interesting at cell 06.

115/119.

On cell 10, the BLMs are 120-122/124-126.

Any reasoning on why the "cruising" cell 06, has such a rich observation?

I have not logged my car recently. These readings were done on a scanmaster.

94 Z28.
355 ci, SRP forged pistons (11.1)
222/222, .471/.471 114 LSA cam.
Mac headers and y-pipe
No cat
B&B TriFlo exhaust.

Cam.
DR.ZED

 

Cruising should be low MAP meaning highly efficient, so not a lot of fuel is needed because the engine isn't working very hard during part throttle cruising.

Look at your MAP, it may be in the 30s or so, compared to 50s+ accelerating.

 

Any ideas on what would cause the low BLMs?

Especially noticeable when I got my B&B tri flow, linked to the headers and !cat.

Cam.
DR.ZED

 

I suppose then you could blame it on the lower backpressure of your new mufflers & removed cat, if there were no other changes made then that seems the only answer.