how have the squires performed? If they are giving you problems replace. I dont know if the mounting pattern is the same. Dont replace em with griffons. You can get good bindings way cheaper if you know where to look.
If the squires are working, leave em
↑↑↓↓← → ← → BA
Given your size/stature I wouldn't worry about spending the money to get a Griffon. I just don't foresee the need. Unless of your doing 20 foot disasters to down kinks or 90 foot gap jumps. If you're have in a specific problem with the Squires just get em warrantied.
I'm 5'10, 185 lbs, with a 32" waist. I put on FKS 14's on my Bacons primarily because I'm a very aggressive skier with a hoss build.