As a tristana, I use my E to zone people. I throw it on a minion and they tend to stay away from that area..
As a jinx you may be able to use your chompers, You don't need to get them out of lane and keep them from farm. but try to keep them where you want them.
v %
0 0 v
0 0 0v
o o /
o /
x
Say X is you.... o and 0 are minions... V is your chompers and % is the enemy champion... You are now keeping them at a far distance to stay away from your chompers. and if they wanna get around, they have to go around them. and by your position, if they try to go around to the right you can use your ZAP on them. /
also watching them and learning their moment patterns might help you land zap on them more often.
when it comes to a blitz always keep a minion infront of you and after he misses a pull try to Poke him a few times.. that thing has quite a cooldown! it will tell him you mean business..
I'm bronze so this might not be too helpful but this is what I somewhat do to zone..