We are in danger of re-inventing the wheel here. This is NOTHING NEW - it has been a factor on the 737 (for one) and probably all low-slung jets since Pontius was a pilot. We have several threads on it. All training departments and manufacturers SHOULD be now emphasing it. All pilots who need to be should be aware of it. I'll even stick my neck out and say you can trim ANY trimmable tailplane aeroplane into a position where the elevators cannot cope, with or without low slung engines.
Let's not go round again in PPRune circles on it, please?
Easter grump over.