Run Perception and Investigation the way I do, which is the way I think they are intended to be used.
Perception tells you something is wrong. It tells you their is a draft, or scuff marks, or that something is off. It never tells you what or how. Sure, perception tells you the wall has a draft that might be a secret door, but without investigation you will never find where the door is or how to open it.
Sure, perception tells you their is a trip wire across the hallway or a switch/trigger on the door hinge. But you will never figure out how to bypass or disarm it unless you use investigation.
Perception tells you the gate guard as a tattoo half hidden on his forearm, but only intelligence is going to tell you anything about it.
Low Int is fine in my games, but don't expect to know why. Go ahead and be a bull in a china shop, but their will be no finesse or innuendo etc.