The benefit is small enough that I don't see stacking as a big issue. The comment about a 100 shield value is a bit off seeing as you would be hitting this on benefit something in the neighborhood of 40 times.
I could see something along the lines of cannot more than double the original value. This would also limit the interaction with the other shield bonus and largely limit the potential real benefit with is not a huge shield, but a huge recharge.
Of course I see the Abbai right now as a literal fish out of water gasping for breath, but that's just me. The changes to the Bimith (Lumbering) basically removed if as a combat ship. The Milani essentially traded its interceptors for crit immunity on 40% of its damage/crew...and one less die to throw on its main weapon. (This is a bad trade btw...) Tiraca got the same deal on interceptors for limited crit immunity. Lakara did okay, and Juyaca just needs a smidge more speed to be good. Course we could never make the Lakara pay for itself already...too short a of range combined with too slow a speed ment it rarely got a shot and just became the last damage sponge on the table, so the Juyaca probably stole it's thunder there.
Ripple