MA Ulm in CBM 1.9x

[Mightypeon]

According to the Wiki, flaming arrows should indeed apply to Arbalests. With them, they reach something like 22 AP damage and partly enter the realm of overkill against Humans.
What about the following unit proposal:

Pavise arbalest: Wears an Ulmish towershield/Ulmish Pavise (great parry values and protection, but reduces attack and defense, adds encumberance) in addition to his Arbalest, has excellent head protection and size 3.
Slow, very difficult to damage with arrow fire and even resistant against deflectable evocations, yet not your best choices when you want a lot of Arbalest shots quickly.

Those could be backed up by unarmoured arbalests (costing less resources), getting a certain combined arms feature.
Imho, the Arbalest could also get a precision increase. IIRC, Arbalests tend to be more precise than crossbows not the other way round.