For example, using the current coefficients - 20% SP, 30% limit, and using the 5.2 stat values shown on the Google Docs link - the effective health of Flameglow ranges from:
162,485 Effective Health [vs. Arms Warriors] to 227,093 Effective Health [vs. Aff. Lock]
The average = 200,741 EH
Using the new coefficients - 40% SP, 20.6% Limit, and using the same stats as above - the EH of Flameglow ranges from:
148,117 EH [vs. Arcane Mage] to 157,609 EH [vs. Aff. Lock]
The average = 154,687 EH
The EH of Ice Barrier = 154,637
So it puts it on the level of Ice Barrier and squeezes that gap together better.