I also use 1 1/2" form. After removal from the form, I grind off glass squeeze out, then drum sand it down to a nice square blank, usually about 1.40 before I like it overall. Then, depending on the poundage I want, I grind down to 1.24 for heavier bows and 1.1 for my usual light bows. This is for real longbows, can't speak to RD's or recurves, which often have wider limbs and I assume would start from wider forms.