I like to keep hickory min of 1.75" wide. 1.5" is getting on the narrow side for hickory.
yes, I agree if you keep that weight and draw length goal.
reduce either and you can go narrower. most NA bows are not more that 1.25 wide, although the english warbow guys often
go 1.5+, but with a longer bow. allow extra depth at the handle if you decide to narrow it some.
a good reference is
Encyclopedia of Native American Bows, Arrows & Quivers: volume 1, Northeast, southeast, and midwest