Hard to say Brad. The only Simms boots I have tried on at the G4's and that was a few years back. As you described, I do remember the toebox being lower volume, but for me that was a good thing. I just couldn't bring myself to endure the extra weight of the Simms boots, although I think are superior with regard to durability and performance.
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I am still not a cop.

EZ Thread Yarn Balls

"I don't care how you catch them, as long as you treat them well and with respect." Lani Waller in "A Steelheader's Way."