Lot of good advice here,we all have our on spin. If i had to rank top conditions of importance to shooting through big hog shields, it would be in this order.
1. Get close ( closer=more arrow energy) IMO 15yards and in
2. Razor Scary sharp BH ( doesn't matter 2 or 3 but make it the sharpest implement you own)
3. Arrow mass ( most accurate heavy arrow you can shoot)
4. shoot horizontal ( if possible, it's easier to shoot through shield with more ummp shooting 90 degrees into shield than at an angle. That shield can turn an angling BH unfavorable ways sometimes. best way to bust a brick wall is run into it straight on.
5. Give it time......it easier to track a dead hog than a live one.IMO