I’ve made hickory D bows that were 1 1/8” wide that pulled 70+# with 1” of permanent set or less. But they were also longer to make up for the fact it was narrower and thicker. They still shot quick for being so long. But a bit of a thump to go with it. I also frequently narrow the handle section a bit. Just make sure you don’t make it bend my hon the handle when you do, think more of an elliptical tiller with the handle just moving if you narrow it. Or you will quickly see lots of set in the handle if you get it moving much.
From what I’ve seen you should be able to go 1 1/4” wide through the limbs and narrow to 1” handle if you want under 45# at 27” draw. 1 1/2” wide with a 1” handle for between 50-60# at 27”. With a good heat treat and a good tiller. You can shift weight and draw weight from there. Essentially the shorter the draw length you intend to pull it the higher the pull weight you can go. And conversely if you intend to pull further you’ll need to lower the intended draw weight for the same width.
Kyle