Okay so here is my list of changes:

Aetherflow: Change it so were a "miss" doesn't cost a stack of AF. This would make the system a lot more forgiving when players make mistakes.

Devotion: This is a tough one for me. Either have it where the SMN can select the player to buff or give it an AoE splash to near by players.

Pet Enkindle: Now this seems so low in DPS considering it's the signature move of your pet. 180s recast but does less damage than Death flare that SMN does every minute. Part of me thinks a huge potency increase would fix it while another part thinks about just replacing Death flare with Enkindle and adjust damage potency to make it equal to DF. You could even rename DeathWyrm Trance to Eikon Trance and even make it to where pets would become a little bigger, hume size, and similar to the actually Primal. Either way Enkindle needs some work.

Demi-Bahamut: Ah the big guy. Honestly I don't like the optimal way to use him; waiting for AF so you can spam as many Wyrmwaves as possible. The community hates that he is in the way. Many feel his sneeze is unimpressive and Ahk Mohr and Deathflare are too similar. Maybe he should be reworked into a real pet; still temporary but has a pet bar and abilities.

Give him say 30s of staying power with his abilities Wyrmwave - 3s recast, Mega-Flare - 10s recast, Akh Mohr - 20s recast, Embolden - Increases rate at which target takes direct hit by __%, and Tera-Flare as his Enkindle.
Give him Range Caster AI meaning he'll stay in one place and cast similar to Summon I instead of following the SMN.