No they can't be too tight. But as I said first time, and others since, stop pulling your hair out and try the simple first. Remove both pedals, clean the threads and, most important the flat face where the pedal meets the crank (both the pedals and cranks) and reattach the pedals. This is 5 minutes work (if you're slow) and solves the problem about 1/3 of the time. Also, if you have, try a totally different set of pedals, so definitively eliminate the pedals as the problem.

If you have clip in shoes and pedals, try a pair of standard rubber or non-clip pedals, since pedal cleat noise is also a common issue.

The goal is to methodically rule out anything that is easy, before starting to take apart more complicated parts. I know of someone who just about disassembled and rebuilt his entire bike chasing a creak for weeks only to discover that one cleat mounting screw was loose and the cleat was flexing up and down under his foot.