No apologies required ...
Again ... Northern, thick skinned and it's only an internet forum.
Ok ... difference of opinions.
I've seriously spent far more time testing slings than I probably should. I was convinced using a proper sling ... and properly ... would seriously improve my scores. I was wrong.
I'm not bad at kneelers. I hit most of them. If I'm shooting a club course ( which tend to be a little easier than comp courses ) I shoot everything 35 yards or under, and with a 25mm or bigger kill, kneeling for practice. Percentages need improving on sitters and most definitely on standers. I decided that's where I need to put my energy and passion. My kneelers, without sling, will look after themselves.
Good luck with all this.