The arrow and broadhead weight sound fine but the broadhead itself... I would not use any mechanical broadhead at the draw weight you' re talking about. Even Steelheads, regardless of what the package says.
That arrow should make your bow a breeze to tune with fixed blade heads. There are too many great fixed blade heads to shoot instead of risking poor penetration with mechanicals.
I also agree. You may not have enough UUMMPPHH to use the mechanicals. JMO. I would recommend into looking at cut on contacts or something like a muzzy.
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"I do not Hunt animals to Kill them. I kill animals because I Hunt." Roger Rothhaar