What TxAg said.
A good flying, heavy arrow, with a sharp broadhead will do the trick.
This topic has been covered on Trad Gang many times, but in my experience(and there are certainly guys here with more experience than me) hunting and guiding for hogs, I have yet to see a hog that was lost due to the shield. In fact, of the guys that have killed truly big hogs with us their arrows blew right through the shield. Again, that's not to say the shield never stops an arrow.
I think your set-up will be fine with either broadhead(to answer your question).