That much bend in the handle reminds me one of my few bend-in-handle bows that, as Jawge says, kicked like a mule. I'd fling a few arrows at whatever draw lenght you have it worked into to assess the handshock and scrape on the mid limbs as Del says (maybe side tillering if knots permit?) to get more draw lenght and reduce the handshock.
I'd definitely stay away from the outer left end area you noted as being thin- it's bending pretty good to my eyes per the attached. Thinning in mid limb would reduce the strain there.
c.d.