Specifically, shorting TVIX and hedging against a sharp large drawdown with long VXX Far OTM calls. I usually keep about 70 percent of this account in cash. Some I hear do 80 percent cash and lighten up on the hedges. But what I was wondering was how to utilize the Kelly formula to this kind of position. When do I rebalance? How large of a loss should I allow -- if I do accept drawdowns up to a point. Is Kelly relevant here? Seems like a modified trend following strategy to me, so maybe not. Thoughts? Thanks in advance.