I'm not the guy to engineer laminates but that sounds close. My experience is mostly with wracking forces on corners of heavy equipment and also small stitch and glue boats. Without adequate gussets materials joined at angles can too quickly become hinges. That's my point.
My amateur thoughts are rather than drill through the new interior 'chainplate' reinforcement, poke through the new fabric-tow to displace the strands around the fasteners before the resin sets up.
Put a generous fillet at the hull side-transom intersection in that area.