I am guessing you are a little far along in the process for this conversation.
If your braces are 3/4" MDF they will do almost nothing, 3/4" hardwood or marine grade birch plywood would be better... some simple geometry changes better still and double the weight of the bracing also a good thing.
Beyond that, I really do not care for polyester batting. 1" fiberglass
http://www.wrap-on.com/contact/contactus.html or 2" Sonex are both quite good. Either of these will reduce the amount of upper bass and midrange coming back through the cone of your woofer... even with a fairly low crossover frequency the added midrange clarity good damping offers is quite significant.
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