About Blindness and Blindfold of True Darkness

[Griffin]

Considering the character a drow ranger 6 / scorpion wraith 5, that is blind, and is using blindsight trough a blindfold of true darkness to have blindsight up to30 feet, is there any other way (aside the scorp wraith temporal ability Perfect sight) to increase the range of the blindsight ability? either the one provided by the blindfold of true darkness or any other way you can think about

Thanks as always for your comments and info

[Popertop]

This won't be much help, but I'm pretty sure there's a feat somewhere, maybe in one of the savage books, that extends blindsense that you have by one stage or 60 feet or something like that.
Extended Blindsense maybe?