Welcome to the board. Glad to have you. Just a few thoughts. Pretty much all flint cocks (hammers are on percussion guns) will need wood relieved at their arc so what you are seeing is normal. Generally when inletting a lock I put a small amount of inletting black on the cock neck and bring it back to full cock. Then, I only remove enough wood to provide clearance, no more.
Also, one thing many new builders, probably including many on this forum when they started, tend to leave a bit too much wood around the lock panel. Sometimes the lock panel is only 1/16 or so wide or even less in some cases, if you look at pictures of original Bedford rifles, they tend to have a nice taper in the size of the lock panel from the tail of the lock plate to the area behind the flash guard. my first few guns tended to leave that panel almost 1/4 inch wide, and they didn't look very good. Maybe because that lock panel is so distinctive to long rifles, we tend to exaggerate it.
One of the hardest things to learn starting out is to just look at a picture of a rifle and actually see what you need to see to make it look right. We all tend to look at the overall shape, not the little details that make each school of rifle unique.
Good luck on your build!