I too believe its safer to have the skid plate on at all times. That oil filter is just way too exposed.
Someone with more wheel time than I can speak to this, but it seems weird that the skid plate took a hit on a "moderate corner" if it was mounted correctly. Any time I've ever scrapped, it was never on a moderate corner.
There was a side stand foot on my bike when I bought it. Everything seemed fine until I got into the twisties, I would scrape but not feel my foot move when it happened. So, I thought it was the center stand that was scrapping, but it had no scratches. Then one day I noticed the foot had a flattened front corner. Come to find out, when I would retract the side stand, this bolted on foot would hit the center stand keeping it from retracting all the way and making it stick out further than it should... So the side stand foot hung lower than the peg feelers and that's what I was scrapping.
So maybe there is something else that's causing the skid plate to extend further than it should. Just a thought.