If I set visibility in ASE at 60 but in the full FSUIPC is it possible to set visibility for different conditions (ie overcast) at 1000? Do they work together that way without a conflict? If so, in the sim, will it follow my FSUIPC settings or will everything be at the ASE 60?

Visibility features should be disabled in FSUIPC when using ASE. ASE has its own visibility smoothing/graduation.