You're absolutely right on the customs not granting XP only when drawing from more than two powersets. All other customs give normal AE XP. I was just figuring that if you wanted to beef up your monster then adding in a few extras might swish up your encounter. And one of THOSE won't grant XP.
Normally the only extras I give a custom character is to an Ally. Since the feature came in I give allies a rez, to give them a little more life/utility to the player, and an Ally was never going to give XP anyway, so no worries.
As for my Praetorian stuff? @TerroirNoir2 has it right, well them being commendable is subjective! But so far I have one trilogy of Loyalist Power and one Trilogy of Resistance Warden, each going from 20-25 and taking place between the end of Neutropolis and the intro to First Ward. The order of each is in my signature.
There's a few other Praetorian AEs out there too. Nyx-Astraea's Webb of Destruction trilogy is very interesting! (She's another Dev Choice writer so is meticulous) Then there's some stuff by @Shockstorm too, plus "Rewarded as a Loyalist Deserves" is well worth playing, though I hope there's a follow on!
Looking forward to seeing how your arc plays out @Chronos!
(I am a little Praetorian geeky! Kam, my avatar there, is my Main Gold 50 and I've been nursing her forward at that level since 2020. Slow going!)