When looking at a force draw curve chart for a r/d longbow, what should stand out to me. I'm looking at the new tradgang mag, and the force draw curve for the bow reviewed has an early hump and then is very straight the rest of the way. Would that indicate a smooth draw or a stacking draw.

If the curve is straight, it is not stacking. How the bow may feel during the draw may depend on other things also (your from, mood, total draw weight and lenght, materials etc.