This may be more during the Religious league war, but i've noticed Austria running a ridiculous amount of alliances occasionally. Like in my current Theodoro game it has 14 countries it is allied with. In a previous game i've seen it allied with 11. Does the AI get a pass on diplo slots during the League war or something? I can't see how it can justify tanking it's diplomacy to run this many alliances. One good outcome from this at least is that if France gets uppity during these times, Austria can summon a nigh unstoppable horde to actually defeat them and defend the empire. This makes me think of a new mechanic that should maybe be created for the HRE. If the HRE comes under attack from outside, the Emperor can CTA any nation within the HRE to help in it's defense regardless of whether it is allied or not. The chance of the CTA being accepted could use the same opinion modifiers for whether the Prince would support the next reform, and then further modify it by rivalries, enemies etc and then the usual modifers for accepting a CTA like WE, Loans and manpower.