Here's the best non-AST speedkill on Susano EX. Total DPS minus LB is 23,708.0. Let's also remove the WHM DPS for now (2,013) and include the DPS of the AST from the
fastest kill on Susano EX (1,587) - changing our total to 23,282 total group DPS.
Assuming absolutely perfect RNG, this means you'd get an Expanded Balance every minute and Sleeve Draw also gives you Expanded Balance. With Celestial Opposition to extend one of those Expanded Balance another 10 seconds, this means you get a total of 100 seconds of 10% balance in a 120 second window - in other words you get an increase of 8.33333% DPS with this kind of uptime.
This means the total DPS gain from including an AST (skewed slightly due to the AST's boosted value already from the fight) would be 1,940.2 DPS (AST total DPS contribution = 3,527.2)
Of course this would be a completely unrealistic expectation. A more conservative estimate might be getting two Expanded Balance which leads to 70s uptime out of 120s for 10% damage up - leading to an uptime of 5.83% or a DPS gain of 1,358.1 DPS (AST total DPS contribution = 2,945.1).
For the sake of argument - let's aim for a single Expanded Balance within that two minute period. 40s uptime out of 120s for 10% damage up which leads up to a 3.33% or a DPS gain of 776.1 DPS (AST total DPS contribution = 2,363.1). This uptime actually kinda matches up the average uptime of the fastest kills for Susano EX (
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Assuming the WHM in the non-AST kill listed above got the same Balance uptime as the example just above (3.33%), WHM's number would become 2,080. Then AST's contribution would be approximately 13% higher than WHM's.
Considering that I'm taking statistics from the pinnacle of the player base and that the average person slamming basic combo would basically be lower than the 50th percentile (and therefore basically do less than half the DPS these players do) - this is my excessively long winded way of saying "You're completely wrong".