Staystrong's post is good. You haven't mentioned any details.
Most naturals need bodyparts trained wice per week or once every four to five days.
This is a bit redundant, especially if you are doing the standard three to four sets of 8 to 12 reps most people do.
It likely is. If you're training a muscle twice per week, it's unlikely you need more than two exercises for it.
You might be able to recover from a very high volume, but it doesn't mean it's warranted. You can try lessening the volume and going harder and focusing on making progress in poundages and see if you get better results. If you're one those people for some reason makes great progress on a ton of volume then that's fine too, obviously.
Again, more is not always better, especially for naturals. I'm not saying naturals can't push things with volume and effort, like some in the "hardgainer" camp think, but you don't need exercise upon exercise to make gains. Make progress in the basics, like deadlifts, rows, pullups, and chinups, and then later on add in isolation exercises and perhaps higher reps and more deliberate movements later on if you need to (eg, slowered tempo, partial reps, pauses, or whatever you need for a better mind-muscle connection).