How can I improve my Infamy?

I used to have a t3 rare but I scrapped it because a t2 epic was better than the rare. And I'm confident that RNGsus will give me another epic soon

 

You shouldn't be using a explosive cannon yet unless you consider farming a legendary version of it more important than raise your infamy, right now. Explosive cannon is a endgame weapon, you should use it when Bhurt is over level 21
PS: what's your Bhurt level?

 

I don't know. I'm at the level where you have the choice of -10% std cannon cooldown or +25% crit damage on sniper.

And I have 2 million on my ex cannon damage, and I am going to finish what I started ASAP

 

IMO until you get around here, explosive cannon is the worst cannon.

 

I literally have no other cannon that deals a lot of damage.

I scrap 95% of things I don't use on my speeder.

Now you know why my inventory is squeaky-clean

 

So you'll have to be patient. You already heavy 2 really good weapons for you to use on future (4, 5 months from now, I guess), you have to choose to keep using the items you already have in order to farm legendary flare gun + explosive cannon (it can be frustrating because your friends will keep raising infamy faster than you) or you can start to rebuild your boat with items that are already good on your level.
I can be wrong, I'm a noob with a gearscore stronger than my usual adversaries

 

Your speeder loadout is surprising me, mine is always like this:

Even my inventory is a complete mess of items I saved since I started playing...

 

Your flare level isn’t really that high and you don’t have fire dmg perks on your ex cannon so I would suggest using ex cannon and blast (I used this until I reached Ace and switched boats) Also use OB

 

From your setup, i would prefer to replace bandage with big shield because, as my experience using soeeder, my HP is very low without a big shield and you can easily get killed by just a few shot