WHM does already hit harder than SGE, the combination of assize, misery and POM usually puts WHM just ahead in full uptime fights and way ahead in fights that have downtime
WHM also benefits more from buffs while SGE is useless at altering its burst window
The imbalance comes that 0.2% more DPS isn’t worth the fact that SGE is a shield healer and while worse than SCH is better than WHM on every other front