You say it looks like they'd spine out. I'm assuming that means you haven't tried tuning them yet? I'd try tuning them first. A 30" 340 spine with 240 gr up front (counting insert) seems stiff to me out of a 46 # bow, especially with a 26" draw. You're also looking at about a 600 gr finished arrow or 13 gpp. Depending on your aiming style that may be heavier than you want. Just something to think about.
Making sure they'll tune and that the trajectory suits you would be my first two concerns. Way down on the list would be the structural integrity of the aluminum insert. The HIT inserts are pretty tough if glued in properly and chances are good if you hit something on an animal hard enough to bend or brake the insert, you aren't getting through it with 46# @ 26" anyway.