Maybe this caused my trouble with sidechaining with Sculpture, too. I use an ES1 instrument track as a source for an "External" exciter in an instance of Sculpture on another instrument track. Sculpture is followed by Izotope's Neutron 3, which causes a lot of latency no matter whether latency compensation is switched on or off. I guess when latency compensation is switched off, I hear the delay of Neutron 3, while switching delay compensation on makes logic delay the ES1 instance, ignoring the fact this kind of "compensation" will feed a delayed signal into Sculpture... I then used the Voxengo Latency Delay plugin for the ES1 track (a helper that reports an adjustable latency to the host), which seems to work for me, but obviously this is just a workaround.
MBP 16" i9, Logic Pro X 10.4.8, 4GB, macOS 10.15.3 (Catalina)
Edirol FA-101, FM8 v1.4.1, Absynth 5.3.1, Pianoteq Pro v6.0.1, Reaktor 6.1.1, SWAM Clarinets & Saxophones, Izotope stuff
CME UF80, TEC USB MIDI Breath & Bite Controller 2http://soundcloud.com/joerg-pegler