Fire/Radi
You can 100% skip Cinders because Choking Cloud is 100,000% stronger and more useful and can set up Containment quicker and more efficiently. And since the page5 patch, Choking Cloud available at level 19.
Thats about it. Being Kinetics you probably already found out that once you get Fulcrum Shift you stop being a Fire Controller and start being a Fulcrum Shifter because its just that powerful. You might think your 300% damage boosted attacks mean something but with 7 other human players/purple triangles/bosses you wont even have time to set up Containment in most situations. But being Radiation Emission on the other hand you are useful from level 2~ to 50. And no, your speed boosted fire imps wont be able to keep up with human players speed.
Fuck Storm Summoning until the devs add -repel on Hurricane
Unless you are solo, if you are solo no one cares what you do.