Itemization
You repeatedly fell behind on power because you bought the wrong early pieces, starting with biscuits and then taking a 15% crit item as your first buy when you were still on zero crit. In this game, that meant you stayed weaker than Jhin for longer than you needed to, even when you had gold to spend. On Tristana, your early purchases should be about immediate lane strength and clean spikes: raw AD, attack speed, and a real first item that actually changes your damage pattern instead of gambling on crit value before your build is online.