Hey Jeff,
I recently won a pair of Inov8's and got the Rocklite 370's.
I have the same problem you do, only my problem is that I have 1 leg that is 5/8" longer than the other.
So I have serious problems with the inside of my ankle and foot on that shorter leg.
My left leg, (the shorter one) has been my Scapegoat forever.
If my ankle did not give me any problems I would run 75 miles a week and be going distances longer than I can even dream of doing right now.
My current mileage is about 35-45.
Any more and my ankle will stop me from running until it heals.
When I go for a major distance trail or any other run over 100 miles, it usually takes me out for 2-3 months.
This is why I only plan 1 long distance hike or run a year.
Anyway, the Rocklite's have been a life-saver.
I still have that same ankle problem due to my leg being the problem, but now I don't fell that I have to worry about twisting my ankle, (due to my awkward gate).
If you want support in a light weight boot, the Inov8 boots are the way to go.
They are also completely runable. More so than most of the trail shoes I've ever had.
The lack of weight does not take anything away from the support either.
The design is just amazing.
They also have the 390's that are water-proof.
http://www.inov-8.com/Products.asp?PG=PG1&L=27