New(ish) Invisible Woman player.. any tips?

Hey guys! I am a relatively newer Invis player (I have like 7 ish hours on her, captain proficiency) she is really quite fun! I play support as a secondary role, but never got a chance to really play or main her because my friend is a support main and Invis is one of her go to’s

Recently picked up support again after a little while (mostly because of the release of Ultron) and I’m trying to learn and get better with a lot of the supports I never really got to play.

Any tips for playing Invis? I move my shield around a lot to low health targets or to someone who could use extra cover. I try to heal as many people as possible with my primary fire but I feel like I’m not doing as much as I can be. I feel like I am still building ult much slower than the other supports in the game and I feel like I have lower healing overall compared to everyone else. Any ideas on what I can do? Thanks in advance :D