Actually you should use detonate instead cascade cos the animation is shorter and have the same cooldown... and even better, try this... inferno clip with firely weapon, wildfire clip with stroke flames or burning determination, then ful detonate untile inferno will enable again... u can use robosidekick... and if u use rifle you can right click between each skill in that way you will do a "plus dmg" taking advantage from your firely weapon too (the weapon clip is not necsary but more dmg is better)
Dude if you use overheat and something else is between you and the target, overheat will not impact.... so you're losing dmg... you must to jump high to impact always