Credit Suisse cuts its ratings and price targets on three smaller oil producers: Carrizo's (CRZO -2.5%) leverage is too high to be overcome in terms of creating long-term value, Kodiak's (KOG -1.3%) share price has been propped up by the company's frequent mention as a takeover target, and Whiting's (WLL -2.2%) future growth is being driven by projects with diminishing returns.