All straightened out as long as possible, my very longest finger is just shy of 3" (that's the middle finger...the index is a full 1/2 inch shorter than that), and at its longest, my palm is 3.25". I already have my Shimano 105 breaks double shimmed. That enables me to hit the lever just closer to my hand than my last knuckle out toward the fingertip.
From the drops with the double shims, I can reach OK, but the double shims do compromise full braking strength, and I want more braking power.
I have comfy ergo bars...love the shape and feel of them except for the braking issue, and I also have fairly good padding (all Specialized comfort stuff), and that could maybe make the bar a little fatter.
I think my hand is about as close to the levers as it is going to get...I don't think position is the issue. I just have hands that are typically a full inch or so shorter than most everyone I know.
"The best rides are the ones where you bite off much more than you can chew, and live through it." ~ Doug Bradbury