Scholar's healing throughput

[Yenn]

The lack of strong Scholar healing throughput seems crippling. They just don't have the ability to handle situations where group burst healing is required.

Scholar has serious trouble keeping up with the Murder damage and the two flies at the same time. White Mage, however, has no issue; they can dump all of their MP into heavy heals, to get us through the phase.
For example, in Amdapor Keep, I dread having a Scholar in my group. They have too much trouble with the latter half of the Demon Wall.

The issue, I think, is that Scholar's healing is centered around shields. Shields aren't useful if two heals are cast in a row, without the shield being consumed, however. This destroys Scholar's throughput and makes them less desirable than White Mage for many counters. In fact, the only two encounters I can think of where Scholar is more desirable than White Mage are Garuda and the Tonberry King. This is because their shields help their party or tank survive any ability that would otherwise almost one shot.

I propose either making the shields stack to a certain amount (this might be too powerful), or increasing the healing done by their shielding spells by 50% if the target is already shielded.