Joe,
Unfortunately, your question is impossible to answer. I think the heritage 150's are the right choice in the line, but proper point weight at the right length can only be determined through bareshafting. I like to start with the broadhead I will hunt with and find the right shaft that will shoot well with the same weight field tip. Usually this requires experimenting with different shaft lengths. Is there an archery shop in your area that can fletch them for you? If so you could order the raw shafts and bareshaft, starting with a full length arrow. Hopefully it will spine a little weak in your bow and you can start trimming it down until it spines right for the bow. In my experience the degree of centershot the riser is cut will mean more than the draw weight of the bow. One other thing, You won't be able to get right on the money watching fletched arrows fly from the bow. There is a fairly good range around the right spined shaft that an arrow will fly pretty good with a field tip, but it won't be as forgiving of a bad release, nor will it be as accurate.