Indeed he is.
Marin, it does look more like simply bending MORE than a hinge. A hinge is kind of more relative to the limb around it than the opposite limb. It's a kink or bowed out area that is bending too much. BUT, you are right about finding them and arresting them early.
In the TBB's it describes a method that I preach a lot for controlled, systematic wood removal that allows for gradual adjustments and few mistakes. It is basically that you mark up the limb wherever you want to remove wood, (kind of like the gizmo does) then remove the marks and check the results. In TBB it's mentioned primarily for weight reduction, but it works for tiller, too, especially early on.
So, do you have a rasp? One way is to use the rasp to lightly and evenly scuff up the belly of the stiffer limb (or stiffer spots). Not removing much or hogging off material, just good diagonal strokes until the rasp bites enough to leave marks. Then use your scraper to scrape all the rasped areas smooth again. Then check tiller, or weight or whatever.
So in your case, the right limb IS stiffer right now, but it's hard to see any trouble spots yet. One pass with the rasp and one with the scraper might bring them closer to the same AMOUNT of bend, where you can then see if the bend is the SAME. You can just use the gizmo and pencil marks for this, too, but if you see an area that the gizmo tells you is WAY too thick, you might rasp, then scrape rather than just taking off the pencil marks.
Alternatively, one thing I do when making bows with kids or scouts is give them all a big fat black crayon. If you want to go slower or more carefully, just scribble over the thick spots or the gizmo marks a bit, then scrape until crayon is all gone.
Yes, you want to scrape, not whittle or carve the belly of the bow.
Lastly, when using a tillering stick like that, find another long lightweight slat or board that has a straight edge, or tie a string between posts that you can run tip to tip when the bow is pulled with the long string. That will really show you stuff like which limb bends more.
