i don't have a video for burst cancelling, but i have some tips from using it and just... general advice, haha.
first of all i'd suggest you run a special build for the PG, the kraken is gonna be your saving grace more or less. the aerospray's ink consumption is fine, strength up is pointless, and anything else is just negligible. so primarily special build (all three special abilities work, so it depends on your playstyle), with room for bomb range up and/or quick respawn if you want any.
second, situational and environmental awareness are gonna be the biggest factors in playing PG. you are pretty much a sitting duck 3/4 of the time, your kills are gonna come from catching people off guard and/or getting up REALLY close. you can rack up a good amount of kills if you play your cards right, just be careful and don't run facefirst into battles you obviously can't win. i'm probably used to this from being an octobrush main, but stealth and ambushing opponents will work best for you.
third, you are a beast at turf control, USE THAT TO YOUR ADVANTAGE! i've been playing with the idea of a ranked comp who has an aerospray PG almost entirely for turf control - i have lost so many battles due to poor turf control. so now you have the weapon with undeniably the best turf coverage in the game (despite it's other setbacks)... that's what you bring to the team. while the rest of your team are tackling the objective, go ahead and ink up the enemy's turf and/or the turf around you. use your burst bombs and krakens to escape danger, and you may just bring your team to victory.
fourth, this is less of a tip and more of a suggestion, get the hang of splatter-dashing if you haven't already. it might just be a lifesaver for you. since you're gonna have to be choosing your battles wisely, and probably can't face any battles other players challenge you to, escaping (or just re-positioning) will be a priority. you might already be fine with it, but it's a valuable skill to learn in any case.
lastly, good on you for sticking to the aerospray! i've been trying to perfect the PG in ranked since it's released, but i'm pretty nervous of how other players might judge me for it, haha. whenever i bring up using it, people just shoot me down, as if it's absolutely inconceivable, which i know isn't true! hopefully you'll become the best aerospray ranked player this side of the scene :p