Ive been watching a good bit of valmaster and infiltration recently to pick up on some chun techniques, is there anyone else i should keep a close eye on?
If you can do what Valmaster and Infiltration do, if you can create the perfect mixture between these two, then I would put 100 Dollar on you to win Evo. 
Other good Chuns:
Lud
Iansanity
Vivi
Skatan
and many more.
watch nemo. all his chun vids are old but theyre exceptional
https://www.youtube.com/watch?v=ylNZP-X1ELE
one of my favorite nemo matches ever.
also haneyama. Valmaster is kind of a more refined version of him IMO. Haneyama is very aggressive, but is kind of reckless at times, whereas Valmaster takes more calculated offense. But theres good stuff to see.
Nuki for old stuff. There’s also Ooitajin and Cojiro. Nashfan for the States