Here is my suggestion to make the job better:

1) Pet control is bad. More so with SCH but it needs work. I would like to select the abilities I want them to auto use.

2) Egi abilities are less party based and more solo based. SMN is a job, which very nature is for use in groups.

-Ifrit ability changes:
---Crimson Cyclone: remove stun add increase damage dealt by party by 10%. 60s cooldown
---Burning Strike: remain the same
---Radiant Shield: Change to Crimson Howl which adds Enfire to the party.
---Flaming Crush: add AoE burn DoT: potency 5 for 10secs

-Titan ability changes:
---Rock Buster: add slow effect
---Mountain Buster: add AoE bind effect
---Earthen Ward: Adds defensive buff to the party.
---Landslide: remove stun add range attack

-Garuda ability changes:
---Wind Blade: remain the same
---Shockwave: add Aero DoT effect (10 potency for 5s)
---Aerial Slash: add AoE blind effect
---Contagion: remain the same

3) Change Tri-Disaster to level 35 and add instant cast with 20 potency for 20s -mainly to help with adds.