[RMT] Extremely important week vs. strongest team in my league.

I'm tied for first with the guy I'm facing this week. Whoever wins this week will probably win the whole thing.

Here's my roster/bench. https://gyazo.com/833f922830c7513457c2b47576c26362

Here's who I'm up against. https://gyazo.com/c8be825f0f94a05926399847a9bc7af4

The free agent pool is bare (the three best free agents are Shiphtur, Betsy, and Mash, to give you an idea) since it's an 8 man league. I feel like I have about a 30% chance of winning with this roster (if UOL underperform and Freeze and Moon have a good week, for example). Should I swap in for CLG players who have a really bad week? Should I chance kfo as flex? Should I try to pull a risky trade?