Pat,
When you mounted your bags did you drill extra holes in the bags or use the (upper)holes already there from the throw-over attachment? Also do you feel it is necessary to add some sort of additional backing to the bags or do you feel the plastic is strong enough without any additional support?
I have the bags and EZ Brackets and this will be my next job after finishing up the cable re-route for the risers.

Many Thanks,

Keith