A video of your shot would help alot, but when switching to the ILF bow did you perhaps alter your shooting style to mimic a target shooter approach (erect stance, super-loose grip, long hold, breaking down/analyzing your form into many tiny steps, etc.)? If so perhaps you've lost the simplicity of style that many find works best with Hill-type bows (and hunting situations).
Sometimes it's possible to overthink how you shoot, making it more complicated than it is and losing concentration on the spot you want to hit. Back to basics might help, maybe spending more time with the Schulz video and less with the modern target archery 101 stuff.
This video clip (one of several he's made) might help. Peter S. can hit what he shoots at, is fun to watch and shows how simple/basic form can be both fun and effective.