STN is noise sensitive and you should try and stick to the requirement to be on the BKY R171 by D8 BKY, a heavy NG (clean) will overshoot D8 BKY and not be inbound (351/R171 by D8 BKY). Your restriction of 220B is a good call, I used to put 210B at D5 and go around the corner at the up speed. Probably the only way to be on the required radial at D8 is with flaps extended depending on the weight. In the 5 years I was based at STN, only once did I have the pleasure of watching my collegue make the restriction at D8 (The response to a bet), I think we had F5 but can't remember.