However, I'd give a neutral conjie a modifier so that the effect is not nearly as pronounced.

For example, a good aligned conjie that called 5 evil servitors becomes neutral (with corresponding penalties). I think this would stop almost every good aligned conjie being happy to call nightgaunts. Sure, a good conjie can rp calling nightgaunts, but without cabal restrictions, over 90% of good conjies choose this rp. Does that make sense? Not to me.

A neutral conjie, however, can call one evil servitor every 200 game hours (say) without it counting towards their "evilness" (and a timer goes in their effects to let them know when they last called one so they don't accidentally mess up). Anything in excess of this counts towards their evilness quotient.

I'd also make smoke-mephits neutral in alignment. I mean, they are basically weak para-elementals, are they not?

Finally, I'd make it (and this is probably even more contentious than the above), that if you want a chance to get a familiar that flies, you can't call your first familiar until hero. This to act against those that delete upon finding they don't have raven and against those that sit at 40 using their raven to scout in order to gaunt. Gaunts are already extremely strong against specific classes, and succumb is no real option at all if there is a gang waiting for the gaunted guy.