It is funny (funny-strange, not funny-ha ha) but I have 4 bikes that I rotate thru regularly, and I think 3 of them had this same symptom: they had an audible click when the right pedal was at about 1 o'clock on the downstroke. All aluminum frames; some outside bearing BB's, one Octalink.
I have started disassembling the BB's, cleaning then reassembling using teflon tape on the BB cups and pedal threads.
So far, so good. All has been quiet since maintenance.
I had always checked tightness of cranksets, chainring fixing bolts, BB torque, lubed pedal threads, tightened handlebars and stems.
I have even replaced my pedal cleats and tried different shoes. Nothing solved the problem till the teflon tape.