You don't list the whole ramble of specifications of the hooks, though I find it hard to believe that a Mustad Circle would bend open, unless you're fishing the smaller sizes from #12 upwards.
If you're breaking hooks, ie: snapping them off at the bend then you've got hooks that weren't tempered properly. This does happen, not much you can do about it really but to finish the packet as fast as you can/.
Always look for the XH, HW, 2XH, 3XH markings on the hook packets otherwise you're buying the light wire trout variant of the hook, which will not work for a sized YellowFish. The labelling differs from brand to brand, but you want to buy the HEAVY WIRE or DOUBLE (2X) HEAVY WIRE variants of all your hooks aside from possibly the ones you use for dry fly.
Something else to experiment with is tying the same patterns on Tiemco hooks and fishing both equally, they're usually stronger than Grip in my experience and I am no longer buying Grip hooks having standardized on TMC for my Nymphs and Caddis, not only for the strength but also due to the size of the gape being much larger than on the Grip.
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