RE: enough power
As I posted in another post of yours that I felt your arrow is to light I still think so.
I took a second look & it seems to be about center of the chart for your set up as you post it.
I would do two things if I were you
1. Go and find out just how fast your fpc is.( not a guess made by mfd.)
2. get a hold of nap & see what they say I have found them to be truthful
even if they can't sell you something.( they will tell you not to or it is ok they will not lie to you)
Alot of people have had bad luck with expandable heads because there set up is on the low end of what they should have.
Stop & think of it this way about 1/3 of arrow energy is used to open the head so what ever you KE is you only get to realy use 2/3 of it to push the arrow out the other side. ( the 1/3 & 2/3 may be wrong but used to help you understand)
As where open heads get to use 100% of the arrows KE.