You're on PS4 right? Honestly I'd try that new PS4 paddle attachment that Sony just released recently. You may not like how that C40 feels since it's a different shape. I love Astro products but companies like Scuf generally have pretty bad reliability.
I use an Xbox elite controller so I would definitely recommend adding paddles, but I think that PS4 paddle pack or the strike pack would be fine. The C40 hair triggers would help (I use mine) but it's not a game changer. I'd look at flipping your shooting trigger to r1 instead of r2 before buying a C40. C40 also won't have any mods for faster semi auto fire or anything like that.