Actually, after I re-evaluated my Burst calculation I realized the Burst streak bonus is virtually useless. The Burst streak (bonus damage at the end) is only 33% of the total Full Burst damage. +30% of 33% yields a 10% bonus to total Burst damage. That's minuscule. In almost all circumstances you'll get more damage, or very similar damage, out of the +40% character damage / +20% HP bonus. Even in the ideal situation where the Burst is ALL your damage, it's only a 5% advantage! In other words, the developers didn't balance the eidolon buff correctly to do what players expect it to do.