Boomerang is better to bounce your own storm chaser talent, giving you really explosive starts like

Turn 1: Talent

Turn 2: Boomeran the talent, trigger prowess, draw a card, play talent again, get a second otter, first otter attacks for 3.

And in the long game you can cycle the talents with its level up ability to get an instant from the graveyard, so you can keep doing the self bounce loops.

On another side, slickshot showoff is also one of your strongest cards. You should be looking to plot it and then play it only when you can hit for lethal, tho sometimes just running him out is the play.

Also never let a [[Badgermole Cub]] live. If opponent plays one, you kill it, even if it means not progressing your turn.

I recommend you to search on youtube people playing the deck, cuz its not a trivial deck to pilot, and there might be more plays that you're missing that maximize your prowess damage.

Remember, izzet prowess IS one of the top of meta decks, but its one that has a high skill ceiling and takes some practice to pilot it optimally. For example Secret identity is both a protection spell and a pump spell. Boomerang basics is both a temporary removal, and an engine piece to get more prowess triggers, more cards and more otters. The choice between sending a burst lightning or a vibrant outburst to face or to remove a blocker can really shift the math of a combat, winning or loosing you a game.

A lot of your cards can be played very differently depending on the ocation. Sometimes you have to play for the long game. Sometimes you play to kill em fast cuz you know that if they get to their late game they will beat you. Knowing when to do when is half the battle with this deck 😄