I think Comp. Lit. applications can be a bit different from English: whereas English is so massive and so unpredictable (departments get between 250-700 applications), it can be wise to apply to more rather than less just in case; many of my friends only were accepted to one or two places out of many, many applications. Comp. Lit. departments tend to get 50-150 applications and so, not to say your chances are higher, but you can usually bet that the applicants are more keen on that particular department to begin with and are not doing the kinds of mass-application dumps that you get with English (also, with Comp Lit you tend to have more focused departments and are looking only at one or two prospective advisors, so there's less of a chance that there are 20 departments with comparable advisors available for you). So no, 8 applications will be probably more than enough.