If the fractal is set as the output device in your DAW, your DAW’s main outs i.e. 1+2 will be automatically routed to the fractal’s out1 jacks, which is why the whole mix is getting recorded through your mic pres. Simply solo the DI track when reamping through the fractal with this method.the entire mix is recorded on the track unless I solo the track I want reamped.
The aggregate device technique works for some people but I don’t really like it.