The need to lighten up the entire limb on the left side of the pics. You've got the entire bow working and that is great. Leave the one limb alone, but cut down the other.
If you're draw weight ends up too light, sand the linen off and back the board with a 1/8" strip of hickory. That's a good way to add 8~12lbs.
I would just take the walnut handle off and wrap it with cord or something. All of my "glue on handle" red oak bows just popped them off unless I pinned it, but I don't trust red oak enough to pin.
Lastly, get rid of the sewing grid. Having a grid only helps if the WHOLE bow fits on it. Without that, it's a distraction. If you got a place you can hand it, get a sheet of peg board...only like $8 at Home Depot. Makes an EXCELLENT grid. When I get my garage in order I'm going to hand a sheet of drywall up and stencil my grid on that.