I need to rek my RL plat V ADC friend as a B2 ADC, any tips?

Hi so im BII and feeling super cocky as im on like a 10game winning streak. Im a very aggresive style adc player. Lately I've been playing alot of cait and graves (last season it was almost all vayne). My sivir and jinx are also strong. Anyways I wanna completely destroy my plat 5 friend, he plays alot of corki, lucian, and graves (and sometimes ashe). The map will be summoners rift blind pick. Im expecting him to play graves, with lucian 2nd or maybe corki.

today I lost 3 games badly in draft (i got countered everytime :( ). so far my train of thought is pick cait as shes a strong laner or sivir to confuse him (as i think he expects me to play cait and counter with lucian) and harass alot when he goes for cs, watch for minion aggro (he used that in my first game to beat me after i had him half health to like my 80% in an all in) and try to take him out or zone him early as his cs is prolly better than mine (i dont wanna switch to passive play style and try to out cs him as im only comfortable as a super aggresive player).

Any tips or help you guys can give me? tomorrow its going down

I also feel I have really good mechanics for a bronze player and my kalista is strong (i'm watching piglet so that gave me the idea maybe i should player her as she seems good in 1v1 especially if i can get that early BG)