Keep in mind if you are upgrading your bow, especially to a faster one, you likely won't have enough spine for 125 heads. So you will be changing arrows too. Or backing your poundage off a bit to get the 340's to work.
In my experience.
With a newer SW model Mathews your specs will have you over 290 fps, which that 15 fps pushes that arrow that much harder. Adding weight to the front will slow it down, about 8 fps, but again, it's harder on spine.
So if you are changing bows, I'd recommend changing your arrow spine as well.
I can make a 340 work with a 125 head, but it's cut short. Really short.
Lots of good broadheads, it's easy to overthink. I have 5 different ones in my quiver. Likely best to stick to a cut on contact, fixed head.