New Tristana build 5.22. need feedback :)

Hello everyone! this is my first post on this forum so I'm not sure if I'm posting in the right section. I just want to get some opinions on my Tristana build with new items and changes to her abilities. Q and E no longer reduce each other's cooldown and W now resets when the bomb explodes. I am currently silver 2. I have only been playing for a year so I don't have much experience. Here's the build that I've been using lately IE, AS boots, shiv, Essence Reaver, LW/hurricane/firecanon, mercurial

Here are my thoughts on each item: IE: core for ADCs with crits shiv: waveclear, crit, AS, MS essence: I know this item is supposed to be for casters, but for some reason I really like it on trist. since Q and E cooldowns no longer reduce i find 30% cdr pretty cool. It also gives me mana sustain so i can spam E and W lol Now in recently I've played several comps where team has no tanks at all ( or just a support that buys some armor) Since LW only affects BONUS armor is it really worth buying it every game? I often get a hurricane instead because it lets me attack 3 targets at once and CRIT! I am not sure about fire cannon because I heard that its not that great b/c its just 1 auto.. Now with this build (if i get hurricane instead of LW) I get 100% crit and max AS. I find it pretty OP. I am using 18/12 masteries and keystone crit mastery makes it even more OP. I dont buy BT for 2 reasons now: keystone crit mastery, mercurial now gives 10% lifesteal

What do u guys think about this build? I wanna know what some of the more experienced players think about this. What im especially interested in is ER on trist and whether i can replace the new LW with hurricane? I am not an adc main but I am trying it out in this preseason b/c rito made adc much more interesting. If any of my thoughts sound stupid keep in mind that Im only silver and I ve been playing for a year. Thanks!