Just installed the BC Compat version you said, still crashed.
Removed BC, BC Compat, and PneumaticCraft, still crashes.
Crash Report.
The fml-client-latest.log is too large to be put into pastebin (880 KB)
I have neither Chisel nor EE3. Try taking Chisel out first and see what happens.
With Chisel2 removed, it loads fine.
Readding PneumaticCraft Build 98, BC 7.0.17, and BC Compat 7.0.9 works.
I think Chisel is the problem.