Arrow weight for elk

I've been shooting 28" FMJ, 340s at 462grs out of a 70lb bow for elk and deer. Their trajectory is flat enough to even be OK for pronghorn.
I'm still debating whether to beef them up a little for my Alaskan moose hunt this fall. I don't really feel the need, but I also know that another 80grs definitely wouldn't hurt.
 
I’m pushing 430 gr Killin Stix Ventilators at 343 out of an 83 lb bow. Shot the Killin Stix originals last year and blew through a cow elk...27 yards quarter to. Usually do t find my arrows but this time I had an illuminated nock. Shoot what you can and have confidence in and pick your shots if your in the lighter slower end of poundage and trajectory.
 
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