If your arrow was tuned at 28 with regular inserts and the lighter heads, IT WILL NOT BE TUNED AT 30" AND A 100GRAIN INSERT!!!!!!!!!!!!!!!
I will be the decenter here, but I would rather see you shooting at a pig with an arrow tuned to your bow, than see you shooting one that is heavy that bounces off your riser and has TERRIBLE flight!!!!
I would recommend narrower 2 blade heads though.
I think one of the keys to PENETRATION is an arrow that is tuned to the bow or vice versa. You loose KE and MO in the crazy oscillations of an improperly spined and or tuned arrow.
BTW - I would guess the arrow would tune better with the heavier point wieght out of your setup, but you have to (Bareshaft Tune and or Broadhead Plane) to find out. If you come from a compound background and are familiar with paper tuning, you could try that as well, but unless you have a CLEAN release, it will be hard to know for sure if you are right.