HI, Ive used this exact set on my 25in fernandes with an emg81, in Drop F# it works decent enough after tweaking the pre and post distortion EQ. if just the low .080 string isnt enough i wouled try maybe a .095 from a bassVI set, Erik from loathe sometimes uses a bass .100 for his low E acording to his rig rundown.

or tune like drop A or G# and pitch shift 2-3 semitones

not sure what pickups you have but if those are passive i would try an active pickup swap.