Showerthought: I used to eyeball every scribe cut till a trim guy in Billings showed me the compass trick
For 6 years I just held the filler strip up to the wall, marked it with a pencil, and shaved it down over and over till it sat right. Then this old timer watched me do it on a $4,200 kitchen run and pulled out a $9 compass, set it to the widest gap, and traced the wall curve onto the strip in one pass, dead on the first cut. Now my offcuts bin is half as full and my installs run about 2 hours shorter, so what's the one dumb little trick that made you feel like you'd been working blind?
That compass trick falls apart the second your wall isn't a clean curve though, because a bowed stud or a bad tape joint throws the whole trace off and you're back to shaving. Half the kitchens I've been in have walls that wander in three directions at once, and a set gap can't read any of that. Sometimes the slow eyeball method is slow for a reason.