well, you are rigth around 10 GPP of draw...and you are shooting a 29 inch arrow..if you draw it a legitimate 28..and the bow is a modern recurve with good performance stats.. I think you should be ok. A heavy arrow gets you all the juice out of your bow that you can get from it, makes the bow quieter- in short, there's a lot of good stuff about heavy arrows and only one negative- they begin to arc more dramatically than lighter arrows beyond 20-25 yards.
If you shoot trad anyway, and are limiting your shots like most, then why would that really be an issue anyway?
There's lots of negative to light arrows- noisy, more easily deflected, tough on your bow, much easier for the animal's body to stop its forward momentum because of its lighter mass- all the things you should be working to get away from.
I started out shooting two blades...back then there weren't really any 3 blades except for bodkins and Hill's Hornets, stuff like that, that really didnt perform well at all.
I now shoot Grizzlies but up until 2000 I shot Magnus 1's. Big bone is the reason I chose two blade heads. You've got all kinds of things working against you with the bigger animals-
skip angles on quartering shots(not penetrating at all but skipping along the ribcage and exiting in places like the armpit, brisket, etc)and big bones- I've seen what big bones can do to broadhead tips and penetration...don't like em..Grizzlies spin INSIDE the animal until they contact bone...enough energy behind them gives them the chance to "bust" through larger stuff by splitting it open.
You might want to read the Ashby reports on TG to familiarize yourself.