an example of an artist who does this flawlessly is noisia. how do they get the sub to follow their nasty mid range reeses so perfectly? the sub fits the mids so well in some noisia tracks it feels like they just somehow added a ton of low end energy to their mid with an eq while still having it sound very clean. icicle is another example, his bass sounds don't feel like a sub and mid mashed together, they are just one solid unit. it's that sound i'm after.
hoping there is an easy solution that doesn't involve me tinkering until the end of time, but i'm willing to do that if i have to haha

another semi-related question is how do i get sounds "morphing" out of the sub. i'm guessing just use a versatile soft synth and add random automation to a low sine, like perhaps automating the amps of voice one and two in massive but have the first one be a dedicated sine voice so to speak..but that kind of violates the whole "sub in one channel, mid in another" rule i've followed since i started producing.