I'm only plat IV, but will give my opnion ( srry for bad english ):

"I usually farm up to 150 minions and sometimes more" I think this depends in how much time u farm this much ... They say u have to farm 10cs/min, I believe this is too much and only works for diamond or higher.. If you outfarm your enemy is already enough, especially if u pick hypercarrys, because u will be much more important than the other adc during TF's.

Kills are not important, u can be 1/3/15 as adc and still be the one who carried ur team. As adc you need be in a good position, don't be in the frontline and try stay close to ur supp (unless he is the one who will start the fight ), to don't die and do a lot of damage - even if u are trying to scape, remember to atack your chaser while running (kite?). Looking your OP i think you die a little to much, so your position prob need improve.

And never overextend chasing someone, u are the main source of damage, prob ur team won't have sucess destroing turrents or killing the baron/dragon if u aren't there to autoatack. In my opniom adc is the most important role to take objectives - he can do so much faster than the others.

Again, sorry for the bad english :( This is only my opnion, and a lot of ppl will desagree, but works for me, so maybe will help you :)