Nevah - enraged speed best glyph evah!
ES is absolutely useless. Since when you have problems sticking to a target? If you have those periods then it's due to immobilize/cc not being snared or lacking 10% movement speed. Bull Rush works for me, but I see quite few other potential glyphs (Spell Reflect/Shield Wall mainly, perhaps Long Charge?), but no way I'd even consider ES ;p