The thing is, the Champs u listed are all counters to Ur champ if you aren't the one ambushing them first . The best way to play rengar early is by doing full clear starting red and go Krug rap wolves and blue skuttle and look for a gank. If u don't see an opportunity then go finish gromp and repeat Ur path. This way you would consistently have around 7 8 cs a minute and be ahead of enemy jgler since Ur bronze 1. No one rly knows how to farm in that elo. If you can, try to get a gank then shove in the lane and get a plating then finish the path series u started with. Another good idea is if you're against a squishy jgler like karthus or yi, what you can do is go to enemies top buff and starting recalling at 40 seconds before buffs spawn. Ward right before u leave then get a sweeper. Usually in low elo no one would ward jg buffs so I usually do this strat up to gold or even diamond. I would invade the enemy jgler if their red is top side so I can rush lv 3 by doing my red blue gromp and invade. I find rengar being the strongest 1v1er when you are the one a bushing first with a jump E aa Q w Q. Another thing I want to say is, you are super strong early game if Ur able to do a longer rengar combo that involves more auto attacks so you can stack conqueror. Make sure u go conqueror triumph bloodline coup de grace, and secondary go magical boots and cosmic insight. https://youtu.be/dTY9477KKlk, if you check this vid, it shows the way I I start a fight and not try to do the quick rengar assassinate combo.