While nothing indicates this will help, you can try raising the handlebars. It just might compensate for too long a reach. But do this only after you've changed the stem and still feel too stretched out. When I say raising the handlebars, I really mean changing to a stem that does this.

Spending a large amount of money is an exercise in self-fulfilling satisfaction. In your mind, you need a rationale to justify what you've spent. This is not as shallow as a placebo effect, because the satisfaction is real. I've certainly done this to myself on some expensive purchases. But I mention it in case you would rather avoid the expense of a custom frame or even the off the shelf carbon frame suggested above. That suggestion has merits, too, and it should cost less than a custom frame.

I've owned lots of bikes of various sizes and gotten them to fit me one way or another. One of them is officially too small for me, and I just put an extra tall stem on it. It looks dorky, but riding it feels fine.