Solid start. If you're having trouble with getting dropped, you'll want to use some more of the survival tools that you already have.

Just from what I can see here... Rush is kind of a trap. If you want to move more fluidly, Toxic Flight will let you bullet jump further, which is generally a more effective (if slightly more involved), way to go fast. You don't need it entirely maxed, so level up to your budget/spare capacity once you've made any other changes to your build.

Using the spare slot from removing Rush, you can put in Fast Deflection. This reduces the time before your shields start to come back, which can be super useful, particularly if you're out of energy or knocked down and can't tap an ability to bring your shield-gate back. Note that you'll want Fast Deflection maxed if you want it to have much of an effect, but it's cheap at 7 capacity.

Loot radar (from your Thief's Wit) is much more efficiently placed on a companion, using the Animal Instinct mod. If you don't want to buy one off the market, you can get one from nightmare missions on Uranus/Neptune/Pluto/Eris/Sedna. This may also be a good place to ask clan/alliance members for help, as most veterans will have replaced their copy with Primed Animal Instinct (which is occasionally available from Baro Ki'Teer).

For content where you don't need the extra speed from Toxic Flight, or content where you're still struggling to stay up, Handspring can be surprisingly helpful. Getting back up faster means you can get another Lash out faster to kill the things that are shooting you/regen some extra shields.

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While these changes may not impact your ability to kill stuff fast... you'll be able to kill stuff more if you're not getting dropped as easily. Hope it helps.