I agree, don't look at USO to achieve a return equal to WTIC. This is a daily follow. In fact, no ETF can follow spot WTIC price for all I know.
Funds like XLE and ERX follow energy company stock indexes, not WTIC. These do trend with oil price and I do believe are the best ETF if you beleive oil prices will increase.
Why does this ETF not follow WTIC? because is about futures, not spot.... see the below...