my DH has chronic sleep apnoea. He stops breathing 63 time per hour. He has has it forever and when in the Navy weighed under 90kgs (he's 6'2"). In recent years he's lost up to 20kgs at a stint and none of that has had any impact on his snoring.
He still has his tonsils though. So I am def going to investigate that.
Good luck Sazz, really hope it helps. Please keep us updated.