If you have or have access to a bow scale, check to see first, if the bows are marked correctly. It is common for the markings to be off by a bit. If your longbow is new, it will probably lose a pound or two as it breaks in. This is also common with bamboo limbs.
You can also check for stacking with a bow scale by drawing at increments of an inch (start at about 25 or 26) and noting the weight at each increment. Most bows gain about three pounds per inch.
Generally speaking, a 60" longbow shouldn't have much stack at 29". I have never seen a bow with only a 1/16" brace range. Most are about an inch. For instance, recommended brace for my 58" Kanatis is 6 3/4 to 7 3/4 inches. Mine are pretty happy at 7".
As has been stated, brace height has no affect on draw weight. Four pounds will make a noticeable difference in the feel of your bow. Another factor may be the length of the bow. If your longbow is shorter than your longbow, you may be feeling some finger pinch, which can make it seem that the bow draws harder.
Hope this helps.