Strat to guarantee the soul hit from the shrumeling so you can always save 0.4 on the second ogre due to soul breakpoints. Just jump and do your first fireball above the shrumeling as the ogre is waking up, your first nail hit will hit it and the ogre.
Fastest strat for getting the shrumal ogres notch on the way to Elder Hu in TE. Mostly applicable to the 1.2.2.1 dream wielder route. Overall saves up to 2 seconds over previous timings of getting the charm notch.
Get exactly 4 nail hits and 1 fireball cast on the right shrumal ogre, dash left to fight the other one, do a nailcancel fireball, and upslash it at the same time you damage tank. If you're lucky this will cancel the freeze frames of taking damage. Immediately after damage tanking, dash to the other side of it and do two nailcancel fireballs to the right. With good execution this will consistently kill both of them, but be careful that your fireball doesn't get eaten by the wall on the left. If you miss one of the tiny mushrooms at the beginning you can hit the leftmost one on the way back. If you come into the fight with 4 hits of soul you should always end with 2, so you'll need 2 extra hits in the wow room for full soul Elder Hu, which only loses about 0.3 seconds.
This is possible on 1.4.3.2+ but inconsistent because the fireball has less range. It should work if the right shrumal ogre does a slamming attack as you're dashing away because it'll move closer, but it would need more labbing.