I am a gold FF with Qatar and you get 20-23kg by default but some agents have arrangements where you get extra bagage by default... I get an extra 20kg and i only use about 8kg normally so i don't bother to check... My mother who lives in India always books through agents around the Southall area who will give you 30kg (plus 15kg for her silver status).
Speak to the agent and say that QR are only giving you X while you said Y and see what you get thrown in... QR staff are generally flexible leaving from LHR or MAN...
