Well I see from the date on these posts I am a little late to reply but I want to add something to the conversation for those who might still be searching for advice.
Nobody has talked much about arrows as much as broadheads.
It is very important that your arrows shoot well from your bow.
And...
I think what you are shooting is okay for elk. I have killed several elk at 40lbs using 525 grn arrows and 125 grn Shuttle-T broadheads. Definitely want high FOC. I prefer arrow weight over speed for good penitration.
At my Advanced age I have lost much muscle strength. I have been hunting elk for years with a 40 lbs bow. I worked in Achery shops for many years, bowhunted for almost 40 years. I prefer heavy arrows for penetration over light weight speed.
You need the heavy arrow weight and heavy FOC broadhead...