Indi-Gravity's usefulnees is still a bit unclear for me.
It can be useful as long as you're not the one with enmity kiting the mob. Just follow the NM / the kiter closely with it on. If you're using a kite tactic it shouldn't be too hard to do this most of the time.

Geo-gravity can be useful but you'd need more than one GEO to get enough slowdown time out of it for it to be worth while- e.g. put bubbles at opposite sides of a 'circle" you want to kite through.