- is about dramatic emotion, + is about being pleasant.
Types with -: SEI, ILE, EIE, LSI, SEE, ILI, LSE, EII
Types with +: ESE, LII, IEI, SLE, ESI, LIE, IEE, SLI
I bolded those types where their use of their "brand" of Fe would be the most obvious.
P.S: This +/- stuff is from Gulenko.